Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc66ab96cbe93a59…

MALICIOUS

PDF

71.5 KB Created: 2021-02-22 07:44:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 67df77cdcbf720ca9fe351bb9a9d16b6 SHA-1: dceca523aea8decddc88b9e68d367f4ed4d576b6 SHA-256: bc66ab96cbe93a598fad8a6097d43c840829fbfee632cc6e96cfab73d1353e2a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('baarspo.ru') and containing a 'utm_term' parameter suggesting a lure. Heuristics indicate the PDF is a link farm on disposable hosting, and ClamAV detected it as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious content, likely for phishing or to download further malware.

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://baarspo.ru/strik?utm_term=bruce+lee+fighting+method+2+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378620/normal_600d8ad15cb49.pdfIn PDF document text
    • http://idem-peshkom.ru/catarina_poe_guidege902.pdfIn PDF document text
    • http://zofoxexizoviro.iblogger.org/wizifilowikepelezu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370740/normal_6007de8e4574d.pdfIn PDF document text
    • http://xikimifo.66ghz.com/sap_bods_tutorial.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365636/normal_5ff9d73f9045f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mobuloremade.rf.gd/8713083797.pdfIn PDF document text
    • http://wugupijejituzog.rf.gd/6020698022.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/regulinufanejav.pdfIn PDF document text
    • http://dikewovob.epizy.com/37348405054.pdfIn PDF document text
    • http://miwufojo.epizy.com/sears_kenmore_sewing_machine_model_158.960.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_off0000dbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDB 5364 bytes
SHA-256: 5e8346b65d57eaaf787c757b1171c09763cdf70428e873da64a13bdaa8dc10b8
font_01_sfnt_off0000edf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF6 10404 bytes
SHA-256: 71b2a6f38197b4996f7d8caa89449863ab2730519ec5648da7115216a6802311

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