Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc1bfcc283d8a16…

MALICIOUS

PDF

92.3 KB Created: 2020-11-20 20:47:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2137fc3e3f4066907d8946eb21202f91 SHA-1: b038308240e36a7a3acbf09eac1d0bba6ea0277a SHA-256: 0fc1bfcc283d8a166b0e400ea48463eae770dc3439c78f1ad797500529095348
214 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, including a known malicious redirector. The heuristic firings indicate it is part of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=magnetism+worksheet+grade+10+pdf In PDF document text
    • https://luzidasagozoro.weebly.com/uploads/1/3/4/3/134319964/f5c36a8b6a19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413846/normal_5fb613d4821e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370269/normal_5f9cf88a45776.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_5f99e13467de3.pdfIn PDF document text
    • https://fosarujup.weebly.com/uploads/1/3/4/6/134624161/jiwirozezetot.pdfIn PDF document text
    • https://rulodewarozuw.weebly.com/uploads/1/3/4/6/134678260/7842708.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417306/normal_5fb58e31c17b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393916/normal_5fa46d72ba654.pdfIn PDF document text
    • https://tenikekiso.weebly.com/uploads/1/3/0/7/130775729/bimatizazusek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369772/normal_5f9fa736894bd.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/mexavofezoxi/general_information_questions_and_answers_philippines.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/bevunokofitiramed.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/74242002505.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/mujem.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11657 5776 bytes
SHA-256: d87d75fdc77e1526c55d37e51a82508839af3a00c08be10faa90db46b0da628e
font_01_sfnt_off000129f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F6 10876 bytes
SHA-256: d16c5cb909fb1db8ed67a504e762048eccae06050f6a99e182cf4ba114552d1b
font_02_sfnt_off00014f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F26 16068 bytes
SHA-256: 48f515d49a265d3cec15dbd2d5f47ba1c49b14e3908a9c859c3ba8f821ef457d

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