Malicious PDF — malware analysis report

Static analysis result for SHA-256 19497e54a8e086e0…

MALICIOUS

PDF

70.7 KB Created: 2021-06-14 11:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 60a5355eb5cf6755b50a9ba8425fcddb SHA-1: 3037b9c5b2f9e12b26a493ec15c8f789d8f53729 SHA-256: 19497e54a8e086e06e43848652e02f7d12a97ead320792f2234730e15a81dd73
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to manipulate search engine results or direct users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://laborke.ru/pbw?utm_term=gw2+chef+discovery PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481411/normal_6064a624be40d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490722/normal_6015a9963a726.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476273/normal_602a5491810e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390643/normal_60477d4db2d7c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444110/normal_5fe4d23390093.pdfIn PDF document text
    • https://lulogozikojag.weebly.com/uploads/1/3/1/8/131858975/wepiteki-zukujakaz-xakobetiwog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476756/normal_6040f1b50ca45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_6011c6cf58d78.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418796/normal_6004156c24781.pdfIn PDF document text
    • https://wadozivapo.weebly.com/uploads/1/3/4/5/134512268/denuginav_gonevubi_kuwab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427504/normal_5ff177a7b6bb0.pdfIn PDF document text
    • https://nazagegakibo.weebly.com/uploads/1/3/4/4/134466174/672941.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389074/normal_603c5eee32701.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369525/normal_5fe8e82ad58cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501042/normal_60c29987702ff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gipovowi.pbworks.com/f/36397194986.pdfIn PDF document text
    • http://zeladejan.pbworks.com/f/tamil_movies_madras_rockers_free_download.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/f/baudrillard_simulacra_and_simulation_disneyland.pdfIn PDF document text
    • http://juxivos.pbworks.com/w/file/fetch/144666486/zisekazibexopu.pdfIn PDF document text
    • http://poforezufovu.pbworks.com/w/file/fetch/144434274/telifetujuzunemawamogo.pdfIn PDF document text
    • http://xujefix.pbworks.com/f/dragon_ball_tenkaichi_tag_team_mod_iso.pdfIn PDF document text
    • http://molitutolu.pbworks.com/f/vuvukuzusupigekufujowigag.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_off0000d8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C8 5284 bytes
SHA-256: 726164e20cc52e1fb0ae6caa70609b59dd263cbf5cff832f51acfd44e245085e
font_01_sfnt_off0000eaeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEB 10216 bytes
SHA-256: fb87dfbc86aca622a60b2e47b9b6c23a1b1d5a4f98e4043775643abf26000394

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