Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f20fff87d5ee28…

MALICIOUS

PDF

76.8 KB Created: 2021-03-29 21:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9855dd3d704dcbadde78628fce761ee1 SHA-1: e280b3c563349e13f4b8e50a76ab1a34d0842615 SHA-256: b4f20fff87d5ee28901be88ee29ff30c3f65da560ed10bf8304660147b4a8989
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable hosting services, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://lozipotod.ru/strik?utm_term=how+to+draw+a+simple+thanksgiving+turkey PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458615/normal_5fe8587595512.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478716/normal_603fb41fb580c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499283/normal_5fdd5d8272c54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367019/normal_5ff8ab36abea5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389824/normal_6049da27e420e.pdfIn PDF document text
    • http://fulukegoror.getenjoyment.net/dionysius_the_areopagite.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370285/normal_60364bca54468.pdfIn PDF document text
    • http://disupiwalu.mypressonline.com/wufoji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://023e3b0e-89aa-4e00-bd19-175c11a0a9c0.filesusr.com/ugd/5f4883_9cdf91dbcaae49ebac932581a15e435f.pdf?index=trueIn PDF document text
    • http://rokipegokibaf.rf.gd/77588131346.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/sokepazipiwa.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/worry_free_business_security_standard_10._0.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/truck_performance_parts_edmonton.pdfIn PDF document text
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_f5a35812f252465b8edfe1b485c13a80.pdf?index=trueIn PDF document text
    • http://gijenuja.epizy.com/auger_electron_spectroscopy_reference_manual.pdfIn PDF document text
    • http://woxepakaj.epizy.com/blitzscaling_book_free_download.pdfIn PDF document text
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_56d8b37c15544d72b93f70626d64dabc.pdf?index=trueIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_47dad5832b4a4204be51aa7aed5b7a11.pdf?index=trueIn PDF document text
    • http://xasibaj.epizy.com/nokevudilokozotono.pdfIn PDF document text
    • http://puwojewemuxa.epizy.com/vopilugonisoravexumirazud.pdfIn PDF document text
    • https://s3.amazonaws.com/futamo/ahmadou_kourouma_soleil_des_independance.pdfIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_10227f685c434ef3a8e89ac3d516e6d6.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_off0000ec81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC81 5652 bytes
SHA-256: 7228066d1409fe2c745603ed72bad34baeb5a17bbddb3939d08baaa5417e8dbc
font_01_sfnt_off0000ffac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAC 11260 bytes
SHA-256: 6930432d8d8c3efa0c325e2b41780ef0bb29de5e6c0bdfec794c594c820d106f

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