Malicious PDF — malware analysis report

Static analysis result for SHA-256 a911c8642d3bff99…

MALICIOUS

PDF

78.1 KB Created: 2021-03-31 09:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fbb81436b13bcdefa23aa085c0d3c707 SHA-1: aece1ee36cf83a2a1d532f7f3befdce01380b57a SHA-256: a911c8642d3bff999d70ac7506305779b64c446fb1be076ca7a4c0fcc196b0c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a mass external PDF link farm, with one primary URL pointing to 'https://bologen.ru/123?utm_term=android+kindle+app+won%2527+t++books'. This suggests the document is designed to redirect users to potentially malicious or spam content, aligning with phishing or SEO manipulation tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://bologen.ru/123?utm_term=android+kindle+app+won%2527+t++books PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427105/normal_605f93c005536.pdfIn PDF document text
    • https://cdn.sqhk.co/keliziniw/cLjaNvp/91648738374.pdfIn PDF document text
    • https://cdn.sqhk.co/moxoxitij/jcnHhex/video_call_from_cartoon_cat_at_3am.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387566/normal_5fe731a517136.pdfIn PDF document text
    • https://cdn.sqhk.co/notenirikev/Rqjhild/my_hero_academia_smash_tap_global.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409114/normal_600c88b155f30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453115/normal_601c787f31a76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420907/normal_60286c2c69f86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409998/normal_60593dddb077d.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/chiNijN/dot_to_dot_connect_the_dots_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460954/normal_5fcc7cf6720ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386605/normal_60623ed4779cd.pdfIn PDF document text
    • https://cdn.sqhk.co/soletibedix/i7kxgjs/nice_guidelines_colorectal_cancer_surveillance.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dezajok/dabesot.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/40115674248.pdfIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/fender_champion_40_guitar_amp_review.pdfIn PDF document text
    • https://0e733887-fd72-4d21-8b10-0a39cafbc931.filesusr.com/ugd/1e4d10_3bac1fec391646b59e3e2630a796ec9f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/casio_ctk_7200_manual.pdfIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_970cdb3eec204cde890ec75595b345ff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/laginekux/27831150456.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_off0000f36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36D 5272 bytes
SHA-256: 157b941469bae17b92eb12e59f302bbcbfe12c8feb4648147ea15abd8e3f7bed
font_01_sfnt_off00010579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10579 10928 bytes
SHA-256: 72b19814973d7006b1726df7554650397462aa11e2902de4c932a1b521430691

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