Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a88d416fb9240b…

MALICIOUS

PDF

82.0 KB Created: 2021-02-17 09:12:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 85ffb96dd972997a7972f15d7be89401 SHA-1: 9e7bba45fe48d12c2c7a5a28e2082d4d45b9e17d SHA-256: c8a88d416fb9240b518e5aec265555164a4716052aaaaa0c308ffc3bbb881892
146 Risk Score

Malware Insights

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

The PDF contains numerous URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to tax filing, consistent with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://maypoin.ru/strik?utm_term=how+to+file+corporate+taxes+online+canada PDF link annotation
    • https://cdn.sqhk.co/parabeset/hgGnBgh/45008182179.pdfIn PDF document text
    • https://cdn.sqhk.co/nesadatifu/ghdgijj/zombie_slayer_survival_mod_apk.pdfIn PDF document text
    • http://natbeach.space/berghaus_air_porch_groundsheetxo7kw.pdfIn PDF document text
    • http://copyright-services-us.com/2k15_download_apkrx9wm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444117/normal_5fd2c40f3ab66.pdfIn PDF document text
    • http://promooffer.site/omron_hbf-514c_manual_englishyb2qm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446915/normal_6007c3aed15b5.pdfIn PDF document text
    • http://copyright-help-report.com/tegazapiledur6m2z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459629/normal_5fd1d38d2d05c.pdfIn PDF document text
    • http://chempion.coffee/how_much_does_dollar_general_warehouse_pay_an_hour2msys.pdfIn PDF document text
    • http://zootime.store/daniwamatagipevealgi.pdfIn PDF document text
    • https://cdn.sqhk.co/fipexuwebo/pFhgjij/jifovugoporigepirugisemep.pdfIn PDF document text
    • http://lufusozajufa.22web.org/giwamadatogifuzadenipow.pdfIn PDF document text
    • http://ipatovaalena.ru/jixuwutiwewereme5k7.pdfIn PDF document text
    • https://cdn.sqhk.co/joxesinejag/JLXHChd/94136208609.pdfIn PDF document text
    • http://lamovingcompany.com/64969833340x64if.pdfIn PDF document text
    • http://naxiramomamaz.66ghz.com/robert_rules_of_order_revised_cheat_sheet.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/wuzalugiseto/alfalfa_hay_nutritional_information.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_off0000f163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF163 5060 bytes
SHA-256: 0089f598a19a6888e4ccc94360da7d4835d1cc8525348719e839c535dd532534
font_01_sfnt_off000102b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B1 12772 bytes
SHA-256: ec4b1be82303eab2c853f7e7bcd43c1a881993596098a51e3741b5c888a6fd64
font_02_sfnt_off00012c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3F 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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