Malicious PDF — malware analysis report

Static analysis result for SHA-256 d995c313d416a518…

MALICIOUS

PDF

94.2 KB Created: 2021-03-29 08:41:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4fd91b69c12e8110f311b0fe001e4e50 SHA-1: 532abc9c2e0297226efbc27182b537c4284e8550 SHA-256: d995c313d416a5186e42c472585df0d573f9e256cac57d2932987d75cb18023c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ponafet.ru/wix?keyword=senran+kagura+new+link+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426424/normal_602109547a122.pdfIn PDF document text
    • https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/zasizulojiki.pdfIn PDF document text
    • https://ladufuvugekowek.weebly.com/uploads/1/3/4/1/134108614/4151355.pdfIn PDF document text
    • https://wetebofi.weebly.com/uploads/1/3/1/6/131608016/6089628.pdfIn PDF document text
    • https://mokabeninenaji.weebly.com/uploads/1/3/4/0/134013120/fegusapunedapix-lazelifa-dekovi-xexafilatum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418777/normal_601949685adb3.pdfIn PDF document text
    • http://noruxonek.22web.org/tales_of_a_4th_grade_nothing_movie.pdfIn PDF document text
    • https://valodoxajub.weebly.com/uploads/1/3/4/4/134435871/b55f1a.pdfIn PDF document text
    • https://jesomufufasak.weebly.com/uploads/1/3/1/8/131872286/ruwilagite.pdfIn PDF document text
    • https://webesetumisurut.weebly.com/uploads/1/3/4/3/134318687/64d886.pdfIn PDF document text
    • https://sisivijujejaliw.weebly.com/uploads/1/3/2/7/132741673/boxipiz.pdfIn PDF document text
    • https://nidewusojob.weebly.com/uploads/1/3/1/4/131438556/8297997.pdfIn PDF document text
    • https://jivekale.weebly.com/uploads/1/3/4/3/134319103/fipop-sitamupe-bixap-fusewebe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417675/normal_5fed243497e99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409258/normal_604cfaa92292f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365525/normal_5fee40127ff21.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ad0cca9-11ac-4b1b-b4dd-231980c66e74/the_greatest_salesman_that_ever_lived.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cda188e6-c8f5-4945-840a-8d84d9744ef8/new_testament_chronological_reading_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cf1db9a-33a4-412d-95bf-9503f87b36a6/how_to_reset_frigidaire_gas_oven_control_board.pdfIn PDF document text
    • http://malinaliwul.epizy.com/daraz_apk_file.pdfIn PDF document text
    • http://gidovofivoj.epizy.com/sears_garage_door_opener_repair_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9464ecba-975d-4030-a739-65ac45b9886b/authors_perspective_graphic_organizer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/832ab322-5086-4490-a3e3-8307c0c75d74/oster_belgian_waffle_maker_walmart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33145698-5bf8-485d-9dc0-b9c2968139c1/thule_bike_rack_roof_racks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c60d05b-5ecd-4f9c-ab7b-6e519649d04e/lenovo_g50-45_windows_7_32_bit_driver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b45960d-3b55-4aff-93f8-90f1e278752f/everything_wrong_with_american_education.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c7e4814-f922-441f-b4db-76dbdbb718ff/50348470532.pdfIn PDF document text
    • http://jusaxokipumata.rf.gd/canon_t4i_price_best_buy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/480c1ff3-add5-4113-bf5f-a0b2c3857f2e/grammaire_progressive_du_franais_niveau_dbutant_download.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001028f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028F 6840 bytes
SHA-256: 8313af532cd9a26afeccb8e5082fb90de0be29f7b6fa15fd3ff4e8b82f4ddfb5
font_01_sfnt_off000119fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FD 5072 bytes
SHA-256: 15fa865e0c9ee415b8558f4acf5e3c31d1d933eb1f4b67999790bbdb365844c3
font_02_sfnt_off00012b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B63 12832 bytes
SHA-256: 0575d81c1ded1c6659cba5ddc1f63a641e16f0147879f68fdeafacf98407a74b
font_03_sfnt_off0001556f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1556F 16064 bytes
SHA-256: 2e7212c14c23e4770532c1c5dcb058c8d236f5118ea2280847459f7ca0536d2b