Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c47e9d71d2f7bad…

MALICIOUS

PDF

74.9 KB Created: 2021-02-25 21:28:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1c5600677d21abe9e92bddd16e0c9021 SHA-1: f23c328c7ea9305276642d0a8ad7901149c1703b SHA-256: 5c47e9d71d2f7bad1ef604a11429c9c2c84b84842fed3d6a4605bab958ccca08
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

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://seumenha.ru/123?utm_term=casio+ga-100mb-1adr+g-shock+erkek+kol+saati PDF link annotation
    • http://dujojiwasemob.mywebcommunity.org/what_are_unforgivable_sins_in_hinduism.pdfIn PDF document text
    • https://sufifova.weebly.com/uploads/1/3/4/7/134736026/9155961.pdfIn PDF document text
    • https://lubawefajisewo.weebly.com/uploads/1/3/4/4/134443910/lexaxukoj_jipatules_zureme_vobex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366622/normal_5ff5fcbf5ebcb.pdfIn PDF document text
    • https://pemimitajeli.weebly.com/uploads/1/3/0/7/130739011/edffdacb737b4.pdfIn PDF document text
    • http://zutatowatipo.mywebcommunity.org/5750602946.pdfIn PDF document text
    • https://revuduxaj.weebly.com/uploads/1/3/5/3/135333309/lopadig.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/95620842652.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416806/normal_5fd1a7ac0b10c.pdfIn PDF document text
    • http://zakewabo.scienceontheweb.net/dr_llaila_o_afrika_books.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377095/normal_6034c2b056926.pdfIn PDF document text
    • https://jixatazibasuv.weebly.com/uploads/1/3/4/4/134402985/1608619.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488100/normal_5fe415f611fe3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499002/normal_5fdb04770311d.pdfIn PDF document text
    • https://wafanipo.weebly.com/uploads/1/3/2/6/132695839/3339912.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/61552064639.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/how_to_clean_carpet_hoover_steamvac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rujidafedisezu.atwebpages.com/solucionario_algebra_lineal_grossman_5_edicion_espaol_gratis.pdfIn PDF document text
    • http://widifusi.myartsonline.com/introduction_to_rhetorical_analysis_essay.pdfIn PDF document text
    • http://gevejonitu.onlinewebshop.net/vizio_d650i-b2_how_to_update_firmware.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_off0000e271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE271 5688 bytes
SHA-256: 444e2087c9e12024f70a84f5b08587c665afd8837977e992f392654f6469c4d2
font_01_sfnt_off0000f59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59C 12872 bytes
SHA-256: e38365684d75062a761c1b0df96e3e4aa229647e3676a9aa109b977bb6c4072a