Malicious PDF — malware analysis report

Static analysis result for SHA-256 52340e138ac49273…

MALICIOUS

PDF

72.3 KB Created: 2021-02-18 18:57:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a30eb7447b6c1a5c5bd4251a8bb1d8fc SHA-1: 4341e7f41a4103b1fb0814b6e4203b466ade9d47 SHA-256: 52340e138ac49273a06d54e03171da29559bb1b64e842996276315eaf3a235f2
186 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it functions as a link farm or SEO spam document. The presence of URLs like 'https://leonvi.ru/wix?keyword=yesmovies+apk+download' indicates a potential lure for users seeking specific content, possibly leading to phishing or malware downloads. No scripts were extracted, but the PDF structure and numerous external links are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wix?keyword=yesmovies+apk+download PDF link annotation
    • https://cdn.sqhk.co/momujolo/igghFmq/neo_geo_pocket_game_cases.pdfIn PDF document text
    • https://winugemu.weebly.com/uploads/1/3/1/0/131070294/3348281.pdfIn PDF document text
    • https://cdn.sqhk.co/malevevipali/1jbicdh/81159216072.pdfIn PDF document text
    • http://xifitubi.22web.org/android_module_unresolved_reference.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380237/normal_5fd68a064d343.pdfIn PDF document text
    • https://cdn.sqhk.co/juzurupivepo/ajehahd/latest_fight_night_game_ps4.pdfIn PDF document text
    • https://gugekomu.weebly.com/uploads/1/3/0/9/130969097/sabet.pdfIn PDF document text
    • http://100p-f.ru/catfish_full_movie_freetbl5e.pdfIn PDF document text
    • https://cdn.sqhk.co/dofewijoras/jpWbgjb/rare_beauty_foundation.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuxolemoga.epizy.com/buvotibakuwev.pdfIn PDF document text
    • http://waraposid.rf.gd/negenuku.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/87386672997.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/transcendental_meditation_guide.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_off0000dfab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAB 5184 bytes
SHA-256: a9511dbeb7f29b46a9fde792ec6b04f46932c9a5e6c5185f30b16a6e4b0b851b
font_01_sfnt_off0000f155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF155 10240 bytes
SHA-256: 530ae6e97daf83cf7eca726f8783773602d88c522fc47b2185d7661f3b3813d0

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