Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03fa71dd45ff8ed…

MALICIOUS

PDF

82.4 KB Created: 2021-03-29 06:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0726d4164be32724f5db202c31927075 SHA-1: 56db795bd66fbfd9b58b56d93290a20934e4df54 SHA-256: a03fa71dd45ff8ed9de0edd334ec8ab789cdd8c24077aacc8630e0df31c1f53d
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 0.9950

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://botokaw.ru/123?utm_term=formation+biblioth%25C3%25A9caire+documentaliste+%25C3%25A0+distance PDF link annotation
    • https://wobelafesuta.weebly.com/uploads/1/3/4/7/134767333/56a06ddb1c7.pdfIn PDF document text
    • https://cdn.sqhk.co/nadipozow/hiGhdhd/12437756995.pdfIn PDF document text
    • http://cethq.xyz/tensor_calculusyv7vc.pdfIn PDF document text
    • https://xebudaxuzab.weebly.com/uploads/1/3/4/8/134872147/3000571.pdfIn PDF document text
    • https://rogusedi.weebly.com/uploads/1/3/4/4/134433103/zakevomu_kewuwurigujavas_kenexo.pdfIn PDF document text
    • https://lomojibopizan.weebly.com/uploads/1/3/4/8/134886372/rubujozimewaxojok.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/gjbgggg/bkash_customer_care_number_tangail.pdfIn PDF document text
    • http://bluhgang.best/46272500427xlk2q.pdfIn PDF document text
    • https://cdn.sqhk.co/pilupenemima/h9pJ7Jx/36289789685.pdfIn PDF document text
    • http://copyrightproblem.com/tableau_software_training_manualcw0ll.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/fgejjhh/pocket_rally_full_apk_indir.pdfIn PDF document text
    • http://gta-msk.ru/jopitexafijaxulomesipp4wu0.pdfIn PDF document text
    • https://cdn.sqhk.co/zalivelo/jihJidc/zeperilawim.pdfIn PDF document text
    • http://helpcenterbusiness.xyz/integra_dtc_9.8_firmware_update5p2nt.pdfIn PDF document text
    • https://wipiwabe.weebly.com/uploads/1/3/4/4/134438476/732515.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bokexizometun/factoring_polynomials_review_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/542722c9-c26d-4b3c-878b-c3d69ca6782c/databook_naruto_volume_1_english.pdfIn PDF document text
    • https://35e1cc1d-5f6c-4a41-9b1b-b9ae8dddc97a.filesusr.com/ugd/351eee_ccb267b1c6c34d8383c7f57ce227906a.pdf?index=trueIn PDF document text
    • https://c2245d91-bd3f-4016-bed3-1da34bcfd793.filesusr.com/ugd/9a652e_85e8f39c7b3440b1951ae2e8a16217aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cc2390d-84f4-4a7d-8f7b-c149946db57a/car_mechanic_shop_near_me_open_now.pdfIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_f54ca8338db14e53a9a8980cf1c9f6ed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/289ce3f4-1dbf-430f-8bec-efdb60a5cf97/tojate.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/the_shack_movie_free_mp4_download.pdfIn PDF document text
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_13558524e07b4ed7a74863462585872d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/632e8000-733f-4bc9-8ea9-b65f0c571cb0/81036614756.pdfIn PDF document text
    • https://f238abdf-92e3-4651-90df-65b6e8a648d9.filesusr.com/ugd/99965f_5a9267b8e2d240079362f17c15d8ff12.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5edf6ad6-54eb-47b7-97f5-5cac1a468110/how_much_is_nike_air_force_at_studio_88.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF321 5532 bytes
SHA-256: 209769e3538d70a17018ae37bcbe81345044ae53186c28db85e585826216796c
font_01_sfnt_off000104d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D6 11936 bytes
SHA-256: 81878ec2863cc7787e8b25e4f60e9226c12ac292369454e4fb342edb16efca4a
font_02_sfnt_off00012b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B30 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34