Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f290318238eb358…

MALICIOUS

PDF

68.5 KB Created: 2020-11-14 10:03:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e3d491e802f97ad288d89b5abee49985 SHA-1: dfda420ad1b6e3980221c4d9fceca5f362126162 SHA-256: 2f290318238eb3589e1576223db7e07fcd090d94306db45f5bb268c7e21d2b13
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing numerous external URLs pointing to disposable hosting services. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure suggest an attempt to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/123?utm_term=the+truth+about+the+letter+j PDF link annotation
    • https://xuzelete.weebly.com/uploads/1/3/2/6/132681171/derefinoxetavufozove.pdfIn PDF document text
    • https://rurujopolobadez.weebly.com/uploads/1/3/4/4/134444805/widewovajuzona-rivavex.pdfIn PDF document text
    • https://xesapidad.weebly.com/uploads/1/3/4/3/134346602/bitewu_jotedolazukaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413013/normal_5f9932a24cb91.pdfIn PDF document text
    • https://kivofijola.weebly.com/uploads/1/3/4/3/134309380/momiwowogukero_gojiwatajibadi.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/gosibokuvefuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405459/normal_5fa9a3a30ccca.pdfIn PDF document text
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/paxapeli_dulovebebaxo_pofeligor.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/nimemoroligamaj-tafixidupara.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/27798942823.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/71960921233.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b98f243-4af5-4ae9-98f2-ad2ab3a353c0/nifegude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5050c9ac-ea6d-4a00-841d-b08bb345d800/aba_operational_risk_management_certification.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_off0000d1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C1 4760 bytes
SHA-256: 4ffe6f025cc7692d2c3d0c49ed951ffaa3fca943d461bda6b17cd5a52f65331d
font_01_sfnt_off0000e1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E9 10360 bytes
SHA-256: 025bbca1e55c1ea3f14ff6663d952b1dd698bf06c0b39ef07e6ad2db96e11b9e

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