Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef70a97da07ee9f7…

MALICIOUS

PDF

80.7 KB Created: 2021-03-27 16:38:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4903bb034c4ce4a6df74cc4ea69520f9 SHA-1: 089118374d43887d230b44c471ae7faa42424b85 SHA-256: ef70a97da07ee9f7845c129acf0e4f25a4ea410b80f027fb91775e9938d2f3e8
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many of which are part of an SEO link farm, suggesting a tactic to drive traffic or distribute malicious content. The presence of a link to a redirector URL, combined with ClamAV and ML detections, strongly indicates a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards malicious intent, likely for SEO spam or phishing.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=ap+us+gov+study+guide PDF link annotation
    • http://azules.ru/clinical_pharmacology_definition_medical_termsc6lea.pdfIn PDF document text
    • http://bandalet.club/715189127ejt.pdfIn PDF document text
    • http://bilkaita.space/wordly_wise_3000_book_5_lesson_20kiwas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461780/normal_601aabb2372e6.pdfIn PDF document text
    • https://cdn.sqhk.co/fonixoligem/ibhbIOU/cut_the_cake_drill_rowing.pdfIn PDF document text
    • https://cdn.sqhk.co/wemerofada/3Ryjdie/airport_madness_3d_pro_apk.pdfIn PDF document text
    • http://neviresutuv.iblogger.org/gukerarav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369663/normal_5ff154ad4f975.pdfIn PDF document text
    • http://wusefarowakuzux.iblogger.org/bagulaxumaxagutodidafobi.pdfIn PDF document text
    • http://tramlaweq.online/397928326612b794.pdfIn PDF document text
    • https://cdn.sqhk.co/wogokodu/gehevic/red_alert_3_online_download.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/wonumafubij/85574870928.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/lonely_planet_russia_epub.pdfIn PDF document text
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_6ecb53c20ad04944b7e84f12ff93190e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/noxuba.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/statistical_analysis_plan_template.pdfIn PDF document text
    • https://034618a9-9b39-4f41-ad18-95bca1d1c80b.filesusr.com/ugd/48d9a1_92c59bb2601e4e29b4d99e0b1113abfc.pdf?index=trueIn 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_off0000ff3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3F 4940 bytes
SHA-256: 38ed587773667c8fd067881700616508548fa9df8ef3fb368ca44540b13af89b
font_01_sfnt_off00011035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11035 11104 bytes
SHA-256: 28fb2b7b9a24f786b0ba41d142b000fd4ba218bc1c17b584128a1ee3e529b1c0

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