Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf6f99a21a171812…

MALICIOUS

PDF

91.2 KB Created: 2021-02-27 09:23:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 735c30280518f08197cd1a6e8f209a6d SHA-1: d23622c1849d43ac09a858f4499fac34f00d4776 SHA-256: bf6f99a21a171812e7e35818f033e1f40bfde79d6b6172f585bd35600f07580f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on various domains, indicative of a link farm or redirection scheme. ClamAV and ML classifiers strongly indicate malicious content, specifically phishing or trojan activity. The presence of embedded URLs and the structure suggest an attempt to direct users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://vilenefex.ru/strik?utm_term=safety+net+ariana+grande+lyrics+meaning PDF link annotation
    • https://cdn.sqhk.co/movumatoz/1entyhd/xazitodak.pdfIn PDF document text
    • https://cdn.sqhk.co/sipobufiw/krhfLKm/car_running_too_rich_black_smoke.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwuwoki/ShgegfP/40802983809.pdfIn PDF document text
    • https://bukowimulo.weebly.com/uploads/1/3/1/4/131407836/kolis-zoledafisi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461509/normal_5fef0bb92b876.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwewiwudesi/YB4v4EC/sticky_blocks_walkthrough_level_5.pdfIn PDF document text
    • https://lesivemiseleji.weebly.com/uploads/1/3/1/3/131381961/f0d2cea47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381551/normal_5feeef8369a66.pdfIn PDF document text
    • https://cdn.sqhk.co/xipitufekaru/jcicRCv/king_female_soccer_player_kneels_for_national_anthem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389801/normal_602edf2781884.pdfIn PDF document text
    • https://cdn.sqhk.co/fegadosijete/plieIfX/51585041454.pdfIn PDF document text
    • https://sikediluselifa.weebly.com/uploads/1/3/1/6/131636826/midasisevifiwek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414500/normal_601a2a7cd122e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444636/normal_601b830a73ca8.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/likerajatob/tf2_loose_cannon_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/64647382614.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/53641181437.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/stealth_cam_xs16_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/19943220582.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/fire_burning_full_song.pdfIn PDF document text
    • https://s3.amazonaws.com/dogevazapiwediw/excludes_crossword_answer.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_off00012769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12769 5548 bytes
SHA-256: 828ba51c2b3f6d8be0e20b346af8ac2b95ab1510a6f7f8768cf5c2cb13db93a7
font_01_sfnt_off00013a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A39 10712 bytes
SHA-256: 343b08113eb3fb10503661e61e9b9da060444d9e5105d4cdccbf06a817901400

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