Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c0e5203c719322b…

MALICIOUS

PDF

65.4 KB Created: 2020-11-18 04:26:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 112b25e93675f1899f566e020bf61fca SHA-1: d67187c8c22b0fec3b793be9bee4c0d431c755fe SHA-256: 2c0e5203c719322b4e46b375584e10bce52b6c7255d73df89bf2b8af6ac14d0d
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on various domains, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafffi.ru/123?utm_term=machine+safety+instruction+manuals
    • https://cdn-cms.f-static.net/uploads/4367640/normal_5f8b9ab4ea861.pdf
    • https://pidofuvu.weebly.com/uploads/1/3/0/7/130739764/2b8b696831.pdf
    • https://cdn-cms.f-static.net/uploads/4365626/normal_5f87ba22e0a91.pdf
    • https://cdn-cms.f-static.net/uploads/4377717/normal_5fb4391ca1173.pdf
    • https://soxupewo.weebly.com/uploads/1/3/4/3/134392520/sebubifotijagiwe.pdf
    • https://xotiroxo.weebly.com/uploads/1/3/0/7/130776105/4532831.pdf
    • https://mipekemodowopu.weebly.com/uploads/1/3/4/5/134584650/d60db5607.pdf
    • https://cdn-cms.f-static.net/uploads/4380229/normal_5f8c21e945223.pdf
    • https://guvodirafed.weebly.com/uploads/1/3/4/4/134475496/8adb28eecda.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rodakarugupoko/bts_song_mr_jatt.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_off0000c397.bin
b19b2b7ad9daeb5b3cf034da6d441a5d2749c9a9da6c06ada80b17caef62b340		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC397 5228 bytes
font_01_sfnt_off0000d549.bin
16717741c1145f17ed277fe521bbfbeb9399036377a336ede0142070013bc0d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD549 10476 bytes

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