Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b9af4d85b006b04…

MALICIOUS

PDF

69.5 KB Created: 2020-11-23 15:41:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03581a2cb0a6162fc8a22d1d3498b07c SHA-1: dc8a1c9dd3a2d357b895b8971ad8c0b84af151de SHA-256: 2b9af4d85b006b04d50fde912d12e8561d743662b734f7d49141794f5df7fd84
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings reveal a PDF containing a large number of external links, suggesting it might be part of an SEO farm or used to distribute further malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the PDF heuristics point towards a phishing or malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=jigsaw+puzzle+pieces+template+free
    • https://cdn-cms.f-static.net/uploads/4478685/normal_5fb2b330637e1.pdf
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/vemufe.pdf
    • https://jononosafopobof.weebly.com/uploads/1/3/4/6/134649788/a890a45e0ec.pdf
    • https://cdn-cms.f-static.net/uploads/4495058/normal_5fb599bbdb274.pdf
    • https://cdn-cms.f-static.net/uploads/4460230/normal_5fb586e67af0b.pdf
    • https://nekarima.weebly.com/uploads/1/3/4/8/134876173/gabudusek_vadevuxa_nuwoxapodoxi_dakizifovulegiz.pdf
    • https://pejopazuzaguwoz.weebly.com/uploads/1/3/2/8/132815183/koroxusegivezenatuta.pdf
    • https://cdn-cms.f-static.net/uploads/4394072/normal_5f9351ea3172f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rezugekolaba/platform_5_cheadle_hulme_opening_times.pdf
    • https://s3.amazonaws.com/jupudizadid/global_framework_agreement_template.pdf
    • https://s3.amazonaws.com/degisapemifa/kesekewamumamovozasig.pdf
    • https://s3.amazonaws.com/kakekojezutok/next_gear_application.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d387.bin
09ff20800c2247b21e8d32c392816adffa8053a400d7671e4b6a91ee7da897c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xD387 5464 bytes
font_01_sfnt_off0000e62e.bin
5546d744ab82a383381d4b62cccfda699263a45ac93a7dfb761bd500a46aac1e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE62E 10240 bytes