Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b4b752e653c94ca…

MALICIOUS

PDF

85.3 KB Created: 2021-04-04 02:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e075d47260da9a9e58141fa259884ec0 SHA-1: 51f129cee81dc6d0d0965a4967e75aa6e9d313e0 SHA-256: 0b4b752e653c94ca25d3ba60ea53d9855f8004bd50db2f34d7c013fee8f48ed3
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 0.9995

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://xezojetit.ru/award?keyword=groin+pain+exercises+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458618/normal_5fd22e8f157dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460970/normal_605fb5450aa37.pdfIn PDF document text
    • http://fallofelin.online/call_of_duty_cold_war_ps4_to_ps5_upgrade_priceus2yh.pdfIn PDF document text
    • http://iceteas.space/palolilefajawalinujozile4p9fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493221/normal_6039e6ea3d9cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452161/normal_6066056114f54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415770/normal_6006f5a02bd23.pdfIn PDF document text
    • http://get3creditscores.info/53343278191rpdy4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411480/normal_603d018abeaa8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454682/normal_6019a11fa3c80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505820/normal_6033f326ac87e.pdfIn PDF document text
    • https://satotujum.weebly.com/uploads/1/3/4/3/134308249/5251559.pdfIn PDF document text
    • https://gomimujetaveve.weebly.com/uploads/1/3/1/4/131406784/1915481.pdfIn PDF document text
    • http://oneitstore.pro/singer_237_spare_parts8jywv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d7b50aa0-fea3-4edc-ba9e-4ed0094b0c60.filesusr.com/ugd/7f614e_f49b589a3e1f4742819eb81b04b2de69.pdf?index=trueIn PDF document text
    • https://d046670e-94b8-4ea2-8efc-69fca9b502c9.filesusr.com/ugd/c0b427_e9175e56a12940c395cd124df860c812.pdf?index=trueIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_0b0967287ddb4faebb0261874c78e830.pdf?index=trueIn PDF document text
    • https://1e6856c5-1481-42a3-8d1a-2a2567f9fa5a.filesusr.com/ugd/a8b033_424ad0f1f68d4dab9f0ab6e76b1f8345.pdf?index=trueIn PDF document text
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_83b7b929f9884ac9b0bc784ca8156528.pdf?index=trueIn PDF document text
    • https://0b7b936c-93ac-4a60-9644-6ba220b934cc.filesusr.com/ugd/b4bf80_e6e5dd147a114f1fad5c1b06c83c1969.pdf?index=trueIn PDF document text
    • https://2559d30b-64cd-4b4d-aaad-e76a675dde99.filesusr.com/ugd/f5a024_16748ec64f7f4900b0b399d529f5ac42.pdf?index=trueIn PDF document text
    • https://3e1d1bad-f645-4ebd-ac75-469e7ff7c972.filesusr.com/ugd/e745be_bbeefc749dd04604914bbd7056b22155.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11078 5216 bytes
SHA-256: abe625ad90ef53f490ab85f33a68fdf2ced42f1a08b3711878f9924bc8b7a792
font_01_sfnt_off0001224d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224D 10952 bytes
SHA-256: 68c79cd463aa397ceadb185532b2cb43ee088bba756dd139edff4348954daff5