Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f502ea42384e913…

MALICIOUS

PDF

71.7 KB Created: 2021-02-14 08:51:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 137c2546ba184253196b46fd6e370554 SHA-1: 40879d77c926883c0d9638f6416aa0e43f2c3d78 SHA-256: 1f502ea42384e9136d62ed50fb58d7b800553dd53198277deb50ee1487500645
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 domains or Weebly subdomains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

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://jottigo.ru/wb?keyword=manualidades%20papel%20de%20seda PDF link annotation
    • http://flymoney.net/fender_vibro_champ_xd_user_manualpkoo7.pdfIn PDF document text
    • https://dovenokitumenu.weebly.com/uploads/1/3/1/4/131482991/noxukepoter.pdfIn PDF document text
    • https://bomoturu.weebly.com/uploads/1/3/1/3/131384468/pakapalepofalo.pdfIn PDF document text
    • https://wumaviki.weebly.com/uploads/1/3/0/8/130874148/773a5ab9fc1c0be.pdfIn PDF document text
    • https://pusurezifokuni.weebly.com/uploads/1/3/4/3/134317864/38b79afd555d0a.pdfIn PDF document text
    • https://kevulukopefot.weebly.com/uploads/1/3/1/4/131453006/25548e6.pdfIn PDF document text
    • https://puruvafapazono.weebly.com/uploads/1/3/0/8/130815059/xuzepidumoru.pdfIn PDF document text
    • https://lokanasa.weebly.com/uploads/1/3/5/2/135299929/4159299.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401517/normal_60075be876037.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387410/normal_5ffc85098d431.pdfIn PDF document text
    • https://xifalazixaxidig.weebly.com/uploads/1/3/0/8/130874217/a163f54e1db1e.pdfIn PDF document text
    • http://mmamba.ru/lekevodemezumutoduph691.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/pewebopufupe/vcds_vag_software.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/7072876948.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/35434169534.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_off0000da2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2B 4860 bytes
SHA-256: 143d16672d723c35b4f5dc51dde31632eb60114a00f57a7ef23b28d5a84a6df1
font_01_sfnt_off0000ead0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD0 11620 bytes
SHA-256: f0d1be80a3f142b99e6a6734209a9f5ce274fdab76beeccdcf23ec3669edc6e8

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