Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cbfe73acd3735d9…

MALICIOUS

PDF

83.7 KB Created: 2021-03-27 16:35:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 493cd9822e80f63f376fa1a732d64d43 SHA-1: 127881f19c9f30d3ecaaf423e71a526ca799bba4 SHA-256: 8cbfe73acd3735d9f54810c89908ad911c9db716cb6ceec8b342e57cd06eea22
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://fokemale.ru/123?utm_term=cervical+cancer+screening+guidelines+south+africa PDF link annotation
    • https://farurepakal.weebly.com/uploads/1/3/5/3/135318469/velupanif.pdfIn PDF document text
    • http://potawuzaj.medianewsonline.com/cub_cadet_model_2166_owners_manual.pdfIn PDF document text
    • https://doxuginuf.weebly.com/uploads/1/3/5/3/135346615/2970835.pdfIn PDF document text
    • https://zemaxixose.weebly.com/uploads/1/3/4/6/134636511/sopikama.pdfIn PDF document text
    • http://zusagukitu.mywebcommunity.org/kawenaviji.pdfIn PDF document text
    • http://kugewezebuvigiw.mygamesonline.org/2003_honda_accord_door_parts_diagram.pdfIn PDF document text
    • http://zitugaxusi.mygamesonline.org/12260697497.pdfIn PDF document text
    • http://kawasus.scienceontheweb.net/60051091442.pdfIn PDF document text
    • http://zeboxagekej.sportsontheweb.net/simijogukodu.pdfIn PDF document text
    • https://mafoxoluz.weebly.com/uploads/1/3/1/4/131483222/1901411.pdfIn PDF document text
    • https://nonejekorozu.weebly.com/uploads/1/3/4/1/134108542/bcf710a0.pdfIn PDF document text
    • http://xakaderinetatu.mygamesonline.org/bepurivelujumegodu.pdfIn PDF document text
    • https://novufetus.weebly.com/uploads/1/3/4/1/134131343/finovefe.pdfIn PDF document text
    • https://vebupefipi.weebly.com/uploads/1/3/4/4/134497137/1cab0fcbb25.pdfIn PDF document text
    • https://sozakipebi.weebly.com/uploads/1/3/0/8/130814717/lojubu_bajozidafilaz.pdfIn PDF document text
    • http://vuvodagedene.scienceontheweb.net/lectura_del_antibiograma.pdfIn PDF document text
    • http://tezoxefakalexo.sportsontheweb.net/charlie_and_the_chocolate_factory_1971_music.pdfIn PDF document text
    • https://debefapedokofip.weebly.com/uploads/1/3/4/3/134373265/276822.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_098466a053c54473bb60a3b18425f9d7.pdf?index=trueIn PDF document text
    • https://6e8b94c7-278c-4a65-9c30-8d61c93a8f31.filesusr.com/ugd/9ff9b8_edfb05d809474818a290bf729aabbf8b.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_off00010938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10938 5248 bytes
SHA-256: 71a1b1c8f2329d095f4696416ad0e5f108e2ad30b1db8448d99fafae8abda974
font_01_sfnt_off00011b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0C 11104 bytes
SHA-256: f16b57b2538d4f2328ce6ab4b5efcfc25a15241060ccb1060375024482ed0316

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