Malicious PDF — malware analysis report

Static analysis result for SHA-256 713b88c129f09181…

MALICIOUS

PDF

68.8 KB Created: 2020-11-18 22:09:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 330a5bd166441bf2693aff83c31b8a9a SHA-1: e09f97e5590ac20d51a6d3e572b1d9834753f145 SHA-256: 713b88c129f09181a20109bae0e79e7b2aef6fb5379e4292ef5757470edf9309
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF containing numerous external links, identified as a link farm by heuristics. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV specifically flagging it as 'Pdf.Phishing.Trojan'. The presence of embedded URLs suggests an attempt to redirect users to potentially malicious sites, aligning with phishing or malware distribution tactics. No scripts were extracted, but the PDF structure itself is weaponized to facilitate external redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/strik?utm_term=best+cheap+smart+tv PDF link annotation
    • https://wazijewafaset.weebly.com/uploads/1/3/4/4/134437152/nerodiborewevij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475999/normal_5fac49e6ca590.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365656/normal_5fa06270488af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420013/normal_5f9f3095bbd10.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/ratixifo/dnd_best_monk_race.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/linoso.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/french_baroque_architecture.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/67404730386.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/vedunurolalilox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff9a7d9b-5dda-4cba-b1cd-b24475318c89/art_of_horizon_zero_dawn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fc3b51d-416c-4680-b53e-e0de374f4775/dibujos_para_unir_con_numeros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de06c69f-f019-4871-b637-9117a2364282/lelajewugud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/944207df-78a0-4c4b-8579-f60043f573f4/pobobaxoxu.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_off0000d054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD054 5252 bytes
SHA-256: a0de5b7b7739bdaa54f0bf8e1d021335320f8124862fe52f322d8a4144f1a040
font_01_sfnt_off0000e212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE212 10732 bytes
SHA-256: 1f00d657329a8bfb246a30974ad4a4a780769ea20e9cb993af6d7923e6ff0325

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