Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f8581270694324e…

MALICIOUS

PDF

138.5 KB Created: 2021-03-13 13:31:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9133765cd19c36230d5c077080ba3180 SHA-1: 929620e6539d893e4c4a664d6ed0194c14bc308b SHA-256: 1f8581270694324e2871dcfa502c483b57c48372427f56788dee638b6b96e253
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://jumiwimov.ru/strik?utm_term=iso+9001+version+2008+standard+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/sepetuvab/gfEMgiE/dead_zed_unblocked_games.pdfIn PDF document text
    • http://pressit.fun/bumblebee_transformer_instructions7zf7i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445735/normal_60438c02ac709.pdfIn PDF document text
    • https://cdn.sqhk.co/kinibemazoz/56d8Jji/91663777708.pdfIn PDF document text
    • https://cdn.sqhk.co/suwajipufo/ZicFigF/xugozupunusovatamodikoge.pdfIn PDF document text
    • http://pushbiz.fun/wivupojififekh495y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409114/normal_5fd644bc6370e.pdfIn PDF document text
    • http://boldly-grow.com/outlook_email_template_builder53uba.pdfIn PDF document text
    • https://cdn.sqhk.co/gikokimofegi/licidhj/fomonutopefipabavozepaj.pdfIn PDF document text
    • https://cdn.sqhk.co/derixosu/Hgehdhb/fasidozewagutowute.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369903/normal_603c468647796.pdfIn PDF document text
    • https://cdn.sqhk.co/potekovibe/iahfgjk/44198885749.pdfIn PDF document text
    • http://medyahanem.com/pepegitinay2vdw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447097/normal_6040c1c3c6c2c.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/jigezilor/movie_based_on_tibetan_book_of_the_dead.pdfIn PDF document text
    • https://2b12d24f-0c9a-4a32-b427-430aba395f0c.filesusr.com/ugd/6cfe90_407b91fc68614e749f03f322e90ca99c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/roll20_pathfinder_playtest_character_sheet.pdfIn PDF document text
    • https://7f58a6d3-5723-489e-a2bd-17fd91e1ddd5.filesusr.com/ugd/655495_bdf89715cd2a4bc6a56939edcc383d6f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nupotukig/bezujinu.pdfIn PDF document text
    • https://f770b3d7-c897-40e0-9323-5ad0abd91552.filesusr.com/ugd/1fa6dd_25e21961880e435f9faa9a067579d92c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bulujono/what_kind_of_knife_is_best_for_self_defense.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001deef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DEEF 5800 bytes
SHA-256: f28f34402ffd0bcb35afe89e7844ae4ddd674c6e32963f2f684d21daf7cf5fc0
font_01_sfnt_off0001f2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F2D5 12636 bytes
SHA-256: c25659b6977bca05e475c6b7658b908dc17ce79e5de8268b878e560f5ade6310

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