Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8836d1a32dada34…

MALICIOUS

PDF

68.7 KB Created: 2020-11-18 03:34:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ceb5ae91da2640f0dfae542541d41cb2 SHA-1: 78f1afa5e35d5acc6c5b7d5bb3befaddffa238dc SHA-256: f8836d1a32dada340a658c63faed6803850ff53fead4cdceb918aca7cb571166
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a link farm with numerous external URLs, many hosted on disposable domains, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded content, though heavily obfuscated, appears to be part of a lure to drive traffic to these external sites, likely for further exploitation or credential harvesting.

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.
  • 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://trafffe.ru/123?utm_term=karen+scott+shoes+size+chart PDF link annotation
    • https://junoxavod.weebly.com/uploads/1/3/1/3/131384771/lusinevu_gisiw.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/5448760.pdfIn PDF document text
    • https://serivuzoforin.weebly.com/uploads/1/3/4/3/134334639/bf6ed.pdfIn PDF document text
    • https://tewodoxes.weebly.com/uploads/1/3/4/3/134368692/zanuxelijabud_sedijabajuwasa.pdfIn PDF document text
    • https://romasagato.weebly.com/uploads/1/3/4/7/134723475/230d9a657570.pdfIn PDF document text
    • https://ximazula.weebly.com/uploads/1/3/0/7/130738777/4360936.pdfIn PDF document text
    • https://neziraninev.weebly.com/uploads/1/3/4/5/134502601/f4121ca0.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/aa30bdc1-a536-45ac-bd66-bbd7b510a06e/vobutexitupexotefofupufal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b154dcd8-989a-4c2d-b2c4-b71b7fb7c5f0/adobe_illustrator_amtlib_dll_crack_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c8cd891-f077-404b-b6f1-228815fe914c/lg_29fs4rl_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/11297064153.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8864cdb7-50fa-45e1-96b9-c60c63332355/nukuzujotiruzejadixu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fee8dddc-7a2d-45ba-99fb-7fb33a035221/pasar_de_gramos_a_mililitros.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/1603260495.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_off0000d378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD378 4876 bytes
SHA-256: 6e632bb1d9ecba20fdae5e4889c1800bbeac3cf62122457055960e37d7b12c15
font_01_sfnt_off0000e412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE412 9936 bytes
SHA-256: 33445cf0272e52f6ebc7d4b2502554b52283fdc386cf3b6489928971f3c66870

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