Malicious PDF — malware analysis report

Static analysis result for SHA-256 127ee5c0233e3bf6…

MALICIOUS

PDF

56.6 KB Created: 2020-11-21 15:54:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4aaab3815dddb28c6536d4c68089e1e6 SHA-1: 78b5e1512b3ec2f3d641356a532bb91ca3a8914d SHA-256: 127ee5c0233e3bf69c2eb7e5eff6aff90260140946edfb38745e4f44750c8063
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, including one to `trafficel.ru`, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URIs indicate it is designed to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=skyrim+twilight+sepulcher+pilgrim%2527s+path
    • https://cdn-cms.f-static.net/uploads/4465555/normal_5faf163318148.pdf
    • https://jewajufigojoxi.weebly.com/uploads/1/3/1/4/131438211/290dc2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/43ad199f-0df9-434e-a480-48bd40d04c48/porsche_911_performance_handbook.pdf
    • https://s3.amazonaws.com/dazifozixawus/romaraxola.pdf
    • https://uploads.strikinglycdn.com/files/60b38d61-0a69-426b-a4d5-6cc89e608c50/run_android_app_on_linux.pdf
    • https://uploads.strikinglycdn.com/files/d92596cb-1066-4ed3-812f-2baa015bb25c/nojunuxo.pdf
    • https://s3.amazonaws.com/nalifij/beranonerizisofazem.pdf
    • https://s3.amazonaws.com/vapelurowar/77584106096.pdf
    • https://s3.amazonaws.com/welutizenop/238921136.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_off0000a2f7.bin
d920ecbd66ee4103f0a19ad4069ffc454e7a5abb8d84f455819179ecf07b2c2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2F7 5740 bytes
font_01_sfnt_off0000b67e.bin
0f7506d1c711999c315f8c11b39fa6e3f12e20f1f3826ba67873caf28e4268b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB67E 9284 bytes

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