Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57035211201b2cd…

MALICIOUS

PDF

65.5 KB Created: 2020-11-10 20:04:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5d80e1679a89f24007042ab91fb0bb42 SHA-1: 9d0762d1c54e3545fa2b2b51b054385ea25d1282 SHA-256: c57035211201b2cdb95ea2d31e80747c86d08c9b65e9c655e7d8541739d9036f
164 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, flagged as a 'PDF_SEO_LINK_FARM', suggesting a tactic to distribute malicious content or engage in link manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious document designed to trick users into navigating to potentially harmful sites.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafftec.ru/123?keyword=bloom+s+taxonomy+questions+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382004/normal_5fa7715f7cc1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384299/normal_5f9b0a4506dfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379371/normal_5f8b23471d74e.pdfIn PDF document text
    • https://kesevaze.weebly.com/uploads/1/3/1/3/131383297/dufaderosovebexa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369781/normal_5f9c856c6e5fd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c391f3b-f69e-48d1-85b1-039760ca739b/96409044920.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/17558263051.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/geographical_map_of_usa.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/prop_bets_for_super_bowl_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/kujajivubuzovanak.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/neural_networks_for_statistical_modeling.pdfIn PDF document text
    • https://s3.amazonaws.com/nepawigexa/xogigibusanurimukixeda.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/novena_a_la_sangre_de_cristo_dia_8.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_off0000c410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC410 5392 bytes
SHA-256: b56b396ad19446539165e02fa9dec60a4336874a6417b546f031db59e3f4e145
font_01_sfnt_off0000d661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD661 10372 bytes
SHA-256: 5ba3aeeb8f37d6aa96e52ceedad024d44059f57c396d8f23d2a556841ff9fde2

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