Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86d0b38e9c75610…

MALICIOUS

PDF

66.2 KB Created: 2020-11-18 00:01:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa9190114a642a3b6f59eb358c0c136a SHA-1: d2bc46ff51b8ce06faeff35dcd0350fb99e4e6b9 SHA-256: d86d0b38e9c756102756ea443c945e131870415f09bac488eaccedb6d87625d4
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan distribution attempt. It contains a large number of external links, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to reference legal content, likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=arizona+criminal+and+traffic+law+manual+2020
    • https://wifajeru.weebly.com/uploads/1/3/4/3/134342489/nodunas.pdf
    • https://dofazodasi.weebly.com/uploads/1/3/0/8/130873943/vitamojobog.pdf
    • https://sazoxizifa.weebly.com/uploads/1/3/4/5/134505384/bumopoluzepawegenami.pdf
    • https://sapatipiragibo.weebly.com/uploads/1/3/4/7/134708637/rokumufegomovud.pdf
    • https://cdn-cms.f-static.net/uploads/4387811/normal_5fb4484a15714.pdf
    • https://lonodoxelu.weebly.com/uploads/1/3/4/3/134305804/vobatorure.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/remuv/subway_surfers_hack_mod_apk.pdf
    • https://s3.amazonaws.com/widetunipet/5783815691.pdf
    • https://s3.amazonaws.com/tesapibebujep/statistical_methods_for_the_social_sciences_free.pdf
    • https://s3.amazonaws.com/baxadelefofibuz/autodesk_pro_mod_apk_3._7._2.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_off0000c362.bin
d7080b0bdc51423333306c745691f2a269ea032a956a619bf86b877e476a9b17		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC362 5392 bytes
font_01_sfnt_off0000d5bc.bin
1279046b8d01e0c6d3aae8edb155b0ba4baa186144d3e3110650f2d0655284fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BC 11124 bytes

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