Malicious PDF — malware analysis report

Static analysis result for SHA-256 07ff5b471bd0de54…

MALICIOUS

PDF

77.5 KB Created: 2021-03-19 19:30:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5c37c86720202e11bd4062192d0440d1 SHA-1: 12a74f66a66aeff6695f0a6dbd7e079d4aa81684 SHA-256: 07ff5b471bd0de54ebc54879a2a2c89cfc7a50bef544de48879f687d554f0983
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 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/123?utm_term=freemake+video+converter+apk+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417207/normal_5ffaafd5704a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384839/normal_6046e16a1c983.pdfIn PDF document text
    • https://cdn.sqhk.co/mivuxakadu/igje8ja/animal_crossing_wedding_cake_toppers_etsy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465263/normal_602a0ee4a100a.pdfIn PDF document text
    • https://cdn.sqhk.co/wemowubire/gdrifKv/56468743489.pdfIn PDF document text
    • https://cdn.sqhk.co/vawikepaf/Jk0taii/zuteporubedanedebuxagaseg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417408/normal_6037403731e04.pdfIn PDF document text
    • https://cdn.sqhk.co/lemusezilaz/bCcOgiV/8933451143.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483587/normal_5fd8b8b87dde2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jilagikudi.rf.gd/74524749340.pdfIn PDF document text
    • http://xetojawik.epizy.com/37414612206.pdfIn PDF document text
    • https://8f0c9b82-9570-4081-bbb7-5e23a534ea09.filesusr.com/ugd/7008f3_67902de8ffa64a588eeb75cec8a6e673.pdf?index=trueIn PDF document text
    • http://xegefonupekowa.epizy.com/what_are_some_different_types_of_tones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0518ce20-0f7b-4315-ad0f-fd3743cc7a7c/vapixipazarivozifelowow.pdfIn PDF document text
    • https://d920bd67-dfaf-4c99-85b0-fcb8118dfb91.filesusr.com/ugd/383849_72ecc1a432b0461aaca459548ee27f49.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f48dc98-b950-4e8e-90e5-3b696ec29e7f/sexual_orientation_test_klein.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55d014d5-193c-40f1-868b-c1c31fefa3c6/a_raisin_in_the_sun_walter_quotes_act_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db24d965-fd5c-47eb-a07c-00fac988c697/line_6_pod_hd500x_vs_hx_stomp.pdfIn PDF document text
    • http://dimogotewebi.epizy.com/car_games_application.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2fc93e5-5cd5-4b4f-aef4-ff35ea94ab2b/organizational_behavior_textbook_table_of_contents.pdfIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_2856c8eea73a4d61bc2c8ded11f14494.pdf?index=trueIn PDF document text
    • https://12350a4d-732a-4148-85a7-4fa27f2a77ec.filesusr.com/ugd/17beed_0b4a1b03652340d386a2dfe083e44ddc.pdf?index=trueIn PDF document text
    • http://gapojetudijo.rf.gd/86276039541.pdfIn PDF document text
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_94c8d8f116cd457485e8c559bb4a0f9d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/60991220-e32b-4596-95a9-1d82e6f74a72/94106286303.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93e369e9-0b08-42aa-aafc-f6703cc199ee/how_to_reprogram_remote_start_fob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc653e7e-f7d6-4378-926c-33ffd61fb1a6/what_is_initial_velocity_in_physics.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF115 5168 bytes
SHA-256: 71bb7ab1b13520441583479d12f221680d3f06c9758c9bd875a371ae047cc3ab
font_01_sfnt_off000102a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A3 10900 bytes
SHA-256: 0f45f58a1bb9fdd4f7538478008239e4f6b5ced652064d4fa1695274d46689a2