Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5605cfa0610c674…

MALICIOUS

PDF

118.8 KB Created: 2021-06-07 02:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f27136348b576fc978765618aa3c4af SHA-1: a2db1406c3aa4dd0d22668e0e2c9ee1d77c98531 SHA-256: b5605cfa0610c6749bb831d1a2b5097294de11ac311c1cb136762a06f64545cd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary URL points to a domain associated with a link farm, suggesting a phishing or SEO spamming campaign. While no scripts were directly extracted, the PDF structure and numerous external links indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ketchas.ru/pbw?utm_term=instalaciones+electricas+residenciales+sena+pdf
    • https://wotipivas.weebly.com/uploads/1/3/1/4/131482993/2737741.pdf
    • https://mekufaro.weebly.com/uploads/1/3/5/2/135294947/tamil_zorezofowoxiwab_fikutawoviza.pdf
    • https://cdn-cms.f-static.net/uploads/4391009/normal_605713995576d.pdf
    • https://zigaxedalinuj.weebly.com/uploads/1/3/4/0/134016671/gizusabajumug.pdf
    • https://cdn-cms.f-static.net/uploads/4450630/normal_6034285a15ff7.pdf
    • https://static.s123-cdn-static.com/uploads/4421943/normal_5fced54c85469.pdf
    • https://cdn-cms.f-static.net/uploads/4367922/normal_601af6ad7179e.pdf
    • https://static.s123-cdn-static.com/uploads/4468871/normal_5ff12914a0bdd.pdf
    • https://cdn-cms.f-static.net/uploads/4368950/normal_605fb2300a205.pdf
    • https://makesagesuli.weebly.com/uploads/1/3/0/7/130740055/fivuxonolelidoxixo.pdf
    • https://cdn-cms.f-static.net/uploads/4475383/normal_605bb9e0bd885.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bezawagiga.pbworks.com/f/sesshomaru_y_rin_fanfic_lemon_terminados.pdf
    • https://uploads.strikinglycdn.com/files/d47509ee-90dc-4df0-a805-343c4ba76bbf/yamaha_moxf8_88-key_synthesizer_workstation_review.pdf
    • https://uploads.strikinglycdn.com/files/aa8b7713-dc17-4e89-a794-707083928cf7/bamumudepitomorud.pdf
    • https://uploads.strikinglycdn.com/files/d4cdbfd3-2ad0-433f-8bfb-1f13eb83df49/97179898942.pdf
    • https://uploads.strikinglycdn.com/files/935328cd-ba8f-480d-a7a5-766f0509bebe/72775369457.pdf
    • https://uploads.strikinglycdn.com/files/5dfbc668-6155-4a34-b2fa-2b825784d7cb/400252969.pdf
    • https://uploads.strikinglycdn.com/files/184112c9-66f0-4a82-8e6a-a054059afbcf/high_level_design_document_contents.pdf
    • https://uploads.strikinglycdn.com/files/cea54f6d-56a0-4a01-8a00-ae1a6473add3/wamisufagevodo.pdf
    • http://funuvutidip.pbworks.com/w/file/fetch/144461487/fuwujifatoranugod.pdf
    • http://rijunepupuja.pbworks.com/w/file/fetch/144562944/taribinaji.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000193e2.bin
aa6df8521247fed42bfd26c396d38a8634004b24c72de94bb33a38c8762602a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x193E2 5088 bytes
font_01_sfnt_off0001a53c.bin
e0e0bb88ceda69532c1888dbb47cec1371bc2fd6584a46e9695469bc1681f246		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A53C 11940 bytes

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