Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7bdd6493d294171…

MALICIOUS

PDF

86.6 KB Created: 2021-02-22 20:05:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ab33bd5242775eed5b49c9cb54003f9e SHA-1: 2f86692c5693f0942607a7f2caa6e9729dd54a0e SHA-256: f7bdd6493d294171e58e6c1572d0848f50e6d6cdcb70e560ccda98315bc2dc6a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 hosting services, suggesting a link farm or phishing operation. The primary URL, 'https://baarspo.ru/strik?utm_term=dave+ramsey+baby+step+1+youtube', is presented as a search result, likely to trick users into clicking. While no scripts were explicitly extracted, the PDF structure and the high number of external links, combined with ML and ClamAV detections, strongly indicate malicious intent, likely for phishing or malware distribution.

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://baarspo.ru/strik?utm_term=dave+ramsey+baby+step+1+youtube PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4496816/normal_601689a0dc6c3.pdfIn PDF document text
    • https://lixobezabutefa.weebly.com/uploads/1/3/1/4/131406736/teruxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369324/normal_603269069fb52.pdfIn PDF document text
    • https://wemizufatevovig.weebly.com/uploads/1/3/4/8/134896488/1229427.pdfIn PDF document text
    • https://molesomux.weebly.com/uploads/1/3/2/6/132681378/fobowox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470038/normal_5fcb53bd37bba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388835/normal_600f992b95a35.pdfIn PDF document text
    • https://jizexukufi.weebly.com/uploads/1/3/4/1/134109318/6d346e1.pdfIn PDF document text
    • https://lobokepodis.weebly.com/uploads/1/3/1/1/131164506/mobudusejiselipazit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393632/normal_5fe49f9cb8ece.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379034/normal_5fcee76445fb4.pdfIn PDF document text
    • https://dunogijejuj.weebly.com/uploads/1/3/0/8/130813547/kenuvuriwosuzow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495059/normal_6009f4fe56034.pdfIn PDF document text
    • https://wapexuji.weebly.com/uploads/1/3/5/3/135329723/dapotamuzuzo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413865/normal_60095ab68c6c2.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/seriposuj/43987463666.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/vixixumudaf.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/the_accountant_movie_dual_audio_720p.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/bobufumafumewifadotepa.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_off00011608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11608 5284 bytes
SHA-256: 582b70107c4013cc0201166cb1b5de77cbb6f7e44468901e7b2ca673e88410a9
font_01_sfnt_off00012800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12800 10880 bytes
SHA-256: 1d8c84df3b2a56dc945ddc89ad28b653253d5ad7f5be3807a950d9ef5a9d7f2e

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