Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d7c087ad33413df…

MALICIOUS

PDF

69.1 KB Created: 2021-04-01 12:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f3586d6f9f8899cced2be318f3eabab4 SHA-1: 31b47b16e647782e8c0c8450876c5917e54d4294 SHA-256: 8d7c087ad33413dfd1cce3b82cad93b638d9a446329bcfe6bc14053bd4143b87
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, many pointing to disposable hosting and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution lure. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/wix?keyword=apa+article+review PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410448/normal_60640e84d1da1.pdfIn PDF document text
    • https://cdn.sqhk.co/nububufi/ehhOLjf/nogiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474462/normal_603ec4f4a633f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467915/normal_60580f8d966d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476596/normal_60598a016e801.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/jgKNvgg/free_cash_flow_entity_approach.pdfIn PDF document text
    • http://vegefojafi.22web.org/the_art_of_electronics_horowitz_solutions.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/2xjfvja/special_agent_fbi_badge.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463263/normal_5fee9651d1a07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426822/normal_6042e923b7865.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382631/normal_604ac9fcaa10a.pdfIn PDF document text
    • https://cdn.sqhk.co/saligoliti/XjbRYha/tipidebiveduka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://perabojon.rf.gd/80277096085.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/wuzadabemanonewuvo.pdfIn PDF document text
    • http://wegefug.rf.gd/lifan_110cc_engine_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/28871799167.pdfIn PDF document text
    • http://bofofopefolag.epizy.com/amlioration_continue_production.pdfIn PDF document text
    • http://mebijatow.rf.gd/fusukazupezidupupob.pdfIn PDF document text
    • http://depevabevidot.rf.gd/70608907355.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/cm_browser_apkpure.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_off0000d359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD359 4888 bytes
SHA-256: f73c468528f07f5469559e09eb2f4b97202e082f5db98761a8fceeb3273c1eb5
font_01_sfnt_off0000e41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41E 10616 bytes
SHA-256: a7728822684b3b39b76d4af0f85d27f574dfe597c5f1ee6c4b537dff253bf405

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