Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c004f786cc7a02…

MALICIOUS

PDF

75.1 KB Created: 2021-02-24 07:19:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ce37df097b0b9adb301b332a5d013424 SHA-1: 779b0dfd809332214c418a1d75ab4c66871534b6 SHA-256: c4c004f786cc7a02739a70a21d7a9e2c6d23af4d2436e0627fb07dc117c81d0c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users.

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://druttle.ru/strik?utm_term=celebrate+recovery+12+step+lessons PDF link annotation
    • https://cdn.sqhk.co/muligumixe/ijdjiHS/pobijomefif.pdfIn PDF document text
    • http://mavito.online/sovizinosajitejatelykm.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/AfjfFjd/sasewulusurususanogedireg.pdfIn PDF document text
    • https://cdn.sqhk.co/jawubibegeba/70iihej/45105169106.pdfIn PDF document text
    • https://cdn.sqhk.co/gefisodir/giQxU8k/8663411475.pdfIn PDF document text
    • https://naruvemekojesez.weebly.com/uploads/1/3/4/6/134685524/tejopap_vurarujafexak.pdfIn PDF document text
    • http://vovpomnim.ru/tejedopiwufewavidafemamuswytxa.pdfIn PDF document text
    • https://cdn.sqhk.co/bidufewo/rgdhfJB/best_pregnancy_week_by_week_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408992/normal_5fee531d96efa.pdfIn PDF document text
    • https://jesisime.weebly.com/uploads/1/3/4/8/134886507/fukerop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387417/normal_6022e874e0c8b.pdfIn PDF document text
    • http://apkweb.net/runazhz20o.pdfIn PDF document text
    • http://leomannapov.com/actually_synonyms_formalsnm11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428083/normal_5fda62a963a8b.pdfIn PDF document text
    • https://cdn.sqhk.co/nejajevafode/ZXiggit/toweweziwuvigepoxojabado.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/kisimujuk/10199075595.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/mubuguzegidolikawemodomu.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_off0000e9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FE 5320 bytes
SHA-256: 68af98ce1b23b0ccc79179b68de9f306d48a5bd373db2355dab4cb2b9686b42f
font_01_sfnt_off0000fc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2A 10144 bytes
SHA-256: 191b46ff28bc638aed5e100ceaf7f5e7269a61fc53d7f810bd9cdb1c1188702a

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