Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7e860f7b9ea44d…

MALICIOUS

PDF

69.5 KB Created: 2021-01-26 13:53:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 9ec2cd90c64c52c403258834fafcc8ae SHA-1: 66e143bfabd804c6ce713a0c814345535fa46721 SHA-256: bd7e860f7b9ea44d7d73ee9e3595888e0a5db7bca94f7a079ae58f53bfa371ac
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, with high confidence. It contains numerous external links, many hosted on disposable domains, indicating a phishing or link-farming scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://traffnew.ru/123?utm_term=870+area+code PDF link annotation
    • https://sowikidorazeku.weebly.com/uploads/1/3/5/3/135306740/faffcd732c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420911/normal_6006bc3e06c6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446635/normal_5fcd791d721e9.pdfIn PDF document text
    • https://cdn.sqhk.co/nafadurip/iiR3vAF/bukexidewiromomuviza.pdfIn PDF document text
    • https://cdn.sqhk.co/figakeves/hegfegc/gun_masters_pawn_llc.pdfIn PDF document text
    • http://duxaromovaxizom.iblogger.org/37453228324.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472479/normal_5fe679c3f0bba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410414/normal_5fe74d87c56d2.pdfIn PDF document text
    • http://wolapikugeb.iblogger.org/new_bhajan_radha_krishna.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://magivaxinel.rf.gd/burrito_sabanero_letra.pdfIn PDF document text
    • http://bozudob.epizy.com/customer_satisfaction_survey_template_for_training.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_off0000d452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD452 5044 bytes
SHA-256: f0dba8d0a71e300027b58ca534e3bb6f1b654ac32aac98926804a119f51beaef
font_01_sfnt_off0000e58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58B 10688 bytes
SHA-256: 2428465b41290620ec534cac7849cdfba738340edbf3ee6c7785dd155ab9fb3d

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