Malicious PDF — malware analysis report

Static analysis result for SHA-256 726b02f342e333ff…

MALICIOUS

PDF

79.4 KB Created: 2021-03-06 08:04:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 05ef321f894ad05d38476bda70d2f352 SHA-1: 8fa608496907c5ae5b6c7f5b99058b879d7a91ac SHA-256: 726b02f342e333ff06891ecf30799f29fb79e7032fdd883fd48de2e30bc8d9e4
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 0.9991

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://vilenefex.ru/wix?keyword=2004+suzuki+eiger+400+4x4+owners+manual PDF link annotation
    • http://tijukilebag.getenjoyment.net/25274268806.pdfIn PDF document text
    • http://vikiduxa.mywebcommunity.org/49498315668.pdfIn PDF document text
    • http://smartycredit.info/52431168130xty59.pdfIn PDF document text
    • http://xavelodezazil.iblogger.org/66755206139.pdfIn PDF document text
    • http://robugipunebib.mygamesonline.org/72170365288.pdfIn PDF document text
    • http://carinsusa.com/3257429405bw9kb.pdfIn PDF document text
    • http://arthromedshop.xyz/reset_toner_cartridge_brother_mfc-9970cdwoa6dh.pdfIn PDF document text
    • http://gimogorox.22web.org/87418609839.pdfIn PDF document text
    • http://wafixevewitope.mypressonline.com/what_required_to_start_your_own_business.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/tp-link_tl-wa850re_access_point_setup.pdfIn PDF document text
    • http://delinapod.mypressonline.com/52568801984.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://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_36aa60f15b37488a87323c045d5916c5.pdf?index=trueIn PDF document text
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_b0f0360c50e74edaa9dc676fb88126ed.pdf?index=trueIn PDF document text
    • http://dojomasamolazib.epizy.com/motorola_ap_5131_datasheet.pdfIn PDF document text
    • http://jowuwivipi.rf.gd/chikku_bukku_railu_song_masstamilan.pdfIn PDF document text
    • http://gizixaxeviduf.myartsonline.com/42881913469.pdfIn PDF document text
    • https://dd907c4b-492b-4b4d-bf3c-9f0b7a2bd2c7.filesusr.com/ugd/96a426_f3f32fd881a84c95a61aed9c9e2d9131.pdf?index=trueIn PDF document text
    • https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_359d649a3e3b4d5f8d52a5be728876b4.pdf?index=trueIn PDF document text
    • https://4eb3a9b5-ca6a-4b2a-896e-878abc754f3b.filesusr.com/ugd/f1ab86_61876148629d497c83e72412a4ae4899.pdf?index=trueIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_5e0103f971bd48569429fee6d39e3bb1.pdf?index=trueIn PDF document text
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_d1ac4982270d42faa1b1aa43da2098d5.pdf?index=trueIn PDF document text
    • https://e1cf253b-b3af-4135-a675-1c3c021177f9.filesusr.com/ugd/111c46_5b6fb214f5e4403a836366a8614fdc80.pdf?index=trueIn PDF document text
    • https://12a3aa02-022d-4218-8efb-90aa4388683d.filesusr.com/ugd/6dfd9b_250d021a495c4edeadfec6a854a4a820.pdf?index=trueIn 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_off0000ecc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC5 5348 bytes
SHA-256: 3f258d6fb09709ade6216e413bb90b78a2a04ac50bb7f797b84bb80077a633ac
font_01_sfnt_off0000feee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEE 10228 bytes
SHA-256: a8b085d1ffe63961c799867ad7d3a73159e98c2ed090f6ffa952d3274cb8e79b
font_02_sfnt_off000121f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F9 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3