Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a49cebf247b1445…

MALICIOUS

PDF

79.8 KB Created: 2021-02-28 06:42:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 016e8fb018ce31ddf9f43c84a9d59fcb SHA-1: a7d4cbb5aef22234772655aa8e117b3e9a35c34a SHA-256: 9a49cebf247b1445bca3156a88cd4ec805aab00d22361907d34750b2c1a0ac8b
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and ML classifiers. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to a technical issue, likely to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://mezovuduw.ru/wix?keyword=coleman+mach+thermostat+not+working PDF link annotation
    • https://safasisi.weebly.com/uploads/1/3/4/4/134472516/6261712.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474727/normal_5fe1097c9dc21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422150/normal_5fdda9b57060d.pdfIn PDF document text
    • https://wedezetepeb.weebly.com/uploads/1/3/4/5/134528952/giromasol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454811/normal_5fdc6940cbf40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405644/normal_5fe8118a2d6fd.pdfIn PDF document text
    • https://cdn.sqhk.co/miwizawi/jht6ifg/retro_quiz_classic_video_games_trivia_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/puranajav/ejighje/planetside_2_shattered_warpgate.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387715/normal_60221a56ee50b.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvukidovime/agim6Aq/moto_x3m_5_pool_party_poki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497688/normal_6016c10b7705b.pdfIn PDF document text
    • https://lirisosu.weebly.com/uploads/1/3/1/3/131384099/gimiwi-wubud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gixunamob.epizy.com/6157072111.pdfIn PDF document text
    • http://bopenakonaj.rf.gd/social_constructionism_mcat.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/89838382866.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/lonitireduxupevupisoliri.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/96019075543.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_off0000fb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB56 5272 bytes
SHA-256: a55a13f909bf31318f321b252cf5855534bc1fd16536f834cc05ee9495729e3c
font_01_sfnt_off00010d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D21 10692 bytes
SHA-256: d5c4517ed0fe9439c79a9de8903cdaeb8c2304be03790df7dd4958161d243070

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