Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72dc3cd1c923652…

MALICIOUS

PDF

72.8 KB Created: 2020-11-26 08:44:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 9c87d111f5c59441e38fa066245d3dab SHA-1: 48a6d1d08f282a3067b35f8845244637da75ae4c SHA-256: b72dc3cd1c9236520dc60b0ecee2aa095564498fa642eb70b15636e2fe8e1b7b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The embedded URL 'https://trafficel.ru/strik?utm_term=the+only+investment+guide+you+ever+need' is likely the primary destination for the phishing attempt, disguised as an investment guide.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://trafficel.ru/strik?utm_term=the+only+investment+guide+you+ever+need PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409606/normal_5f9326e82385f.pdfIn PDF document text
    • https://kaxobemux.weebly.com/uploads/1/3/4/6/134676595/38745f35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368758/normal_5fa082358565e.pdfIn PDF document text
    • https://sodapovi.weebly.com/uploads/1/3/4/4/134494820/9960318.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pewebopufupe/5033035997.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/gevukaxu.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/82517364671.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/fajakipowekunenuri.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/48450979142.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/62259026733.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD271 5024 bytes
SHA-256: 708098025011186bc37bb267889ff020b00351e86b1038f2f8eadf90725aff74
font_01_sfnt_off0000e35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35F 10856 bytes
SHA-256: a742f083d511bc2e8296689c8129459871c49feb41671e152b785af6f06cb810
font_02_sfnt_off0001087d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087D 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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