Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a059c55ebe75d3…

MALICIOUS

PDF

74.7 KB Created: 2021-03-01 06:14:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d697b5c44479ac838799a8e58ae0f7f5 SHA-1: 227ee7bb92ff987cedb175568441d761dc83d378 SHA-256: 73a059c55ebe75d358e39393cb801ba823dfeee9811e4eb6e482592f2db2fef9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware distribution or phishing campaigns.

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
  • 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://kuzutuzo.ru/123?utm_term=hoover+steam+clean+manual PDF link annotation
    • https://radunepik.weebly.com/uploads/1/3/4/6/134617153/6944110.pdfIn PDF document text
    • https://cdn.sqhk.co/xotabuti/efdRUib/81199724967.pdfIn PDF document text
    • http://amorexpo.com/jopaximukufetsp54.pdfIn PDF document text
    • https://cdn.sqhk.co/xekutenupi/qhiSKid/xajipexazudaguvas.pdfIn PDF document text
    • https://cdn.sqhk.co/posukomokufi/fkh7Ehj/78239110493.pdfIn PDF document text
    • http://zitugaxusi.mygamesonline.org/zaregaravilopetabeweri.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/ihEpdgg/42103276766.pdfIn PDF document text
    • https://zotolibufu.weebly.com/uploads/1/3/1/0/131069899/pejonaxunebiz_toxagesiwobokuw_juvazi_fewekuwipi.pdfIn PDF document text
    • http://zugugalepew.mypressonline.com/zozisatexijobegubijuboxon.pdfIn PDF document text
    • https://xukafubisek.weebly.com/uploads/1/3/4/2/134265855/zikabiv_zosikur_puxisoxopavaw_padogurapimeg.pdfIn PDF document text
    • https://woxopipuwesubaj.weebly.com/uploads/1/3/1/4/131453061/11f928ae0adf80.pdfIn PDF document text
    • https://cdn.sqhk.co/puxezuxivas/ggziigr/40349809149.pdfIn PDF document text
    • https://mezuxanivatanid.weebly.com/uploads/1/3/4/4/134499991/069dd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://medexode.atwebpages.com/ludamemixasitemuputomizi.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/90843299070.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/pogesod.pdfIn PDF document text
    • http://nibizuladode.onlinewebshop.net/91531604756.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_off0000e6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CF 4964 bytes
SHA-256: 8fbed90c27535985c504ae022c1ce87273a53587e7273bac0bfa7b64d6ec89e6
font_01_sfnt_off0000f79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79F 11360 bytes
SHA-256: 44a521a836155f6dfc056379d4d75b4c79771aad994a00d24b48823a5d5406a5

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