Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b361336cfa4805…

MALICIOUS

PDF

86.3 KB Created: 2021-03-26 08:41:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 5037cfbcdfce642072c2206b876b6415 SHA-1: 4f5ef73ef648c8bb5936b325f2605cbf171a45df SHA-256: 33b361336cfa4805740e7427d228b51adf6e711cf748fe819d10d8f057839aa9
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to disposable hosting services, suggesting a link farm or SEO spam operation. The document's content is obfuscated, but the presence of external URIs and the ML classifier's high confidence score indicate malicious intent. The ClamAV detection further supports this, identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/wix?keyword=power+of+attorney+form+illinois+in+spanish PDF link annotation
    • https://juwopivevonu.weebly.com/uploads/1/3/4/6/134682880/61e50f5.pdfIn PDF document text
    • https://sovuzozasofebod.weebly.com/uploads/1/3/4/3/134343281/mazofafifomibe-xafogejo-gitapixu-bulovu.pdfIn PDF document text
    • https://jiwejezagaxu.weebly.com/uploads/1/3/5/3/135325467/boloxenatu-fuzutopukiv.pdfIn PDF document text
    • https://mifesala.weebly.com/uploads/1/3/2/6/132683173/8179548.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380211/normal_6010936884e08.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzomowa/hjiboy9/indesign_brochure_templates_half_fold.pdfIn PDF document text
    • https://valefeka.weebly.com/uploads/1/3/5/3/135345526/rufivi.pdfIn PDF document text
    • https://cdn.sqhk.co/josurowelimu/guYiaOd/bimbo_bakeries_usa_email_address_format.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379363/normal_5fe4ff4734ba5.pdfIn PDF document text
    • https://mijutadozas.weebly.com/uploads/1/3/4/5/134590660/kigalub.pdfIn PDF document text
    • https://cdn.sqhk.co/votexeruwiti/hhgIidj/85523301486.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/memobofilenabon/icd_9_code_for_urinary_tract_infection_unspecified.pdfIn PDF document text
    • https://d0f5cf02-e55f-42e7-ba97-8a4d5a2b8368.filesusr.com/ugd/7f59a0_aed81ee50c8d47c08e704e806492c2d1.pdf?index=trueIn PDF document text
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_ce051e9a5fe44ab2876b4bff949e506c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/marketing_performance_conceptual_framework.pdfIn PDF document text
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_5cc4825afb8d4014a3ebad0906188af3.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B8 5124 bytes
SHA-256: 31449bec95dce58fadf7627aa6e390820c37dbb249f868e94a9bf5dbcb9efd88
font_01_sfnt_off000119fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FB 10600 bytes
SHA-256: c8cae76f09ed0cb9a035e39ff1af4b132e8c47db28f0c4ff1d71ad72c9c774ee
font_02_sfnt_off00013df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF5 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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