Malicious PDF — malware analysis report

Static analysis result for SHA-256 de12c179fc6aa64b…

MALICIOUS

PDF

71.5 KB Created: 2021-01-12 11:20:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 34b56e8b7883ba7decf48831e0346e53 SHA-1: eda3aa1048e72de529cb92491328648f88252fad SHA-256: de12c179fc6aa64b22e42b81f787397f495dfbc2f20833143cc74fdfa2b8c026
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The document body, though heavily obfuscated, suggests a lure related to a 'termination letter garden leave template'. The PDF contains a large number of external links, many hosted on disposable domains, pointing to other PDFs. This behavior is characteristic of SEO link farms used to distribute malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?utm_term=termination+letter+garden+leave+template PDF link annotation
    • https://site-1171771.mozfiles.com/files/1171771/83987850989.pdfIn PDF document text
    • https://site-1176088.mozfiles.com/files/1176088/certificate_of_conformity_car_germany.pdfIn PDF document text
    • https://rezalebivug.weebly.com/uploads/1/3/0/9/130969918/fajoxoned.pdfIn PDF document text
    • https://site-1173855.mozfiles.com/files/1173855/tidogaduxisijuwemivegizu.pdfIn PDF document text
    • https://cdn.sqhk.co/mosugukasiba/midrhgs/komonokararu.pdfIn PDF document text
    • https://latenenagizogip.weebly.com/uploads/1/3/2/6/132696064/4461744.pdfIn PDF document text
    • https://viwosakizipisot.weebly.com/uploads/1/3/5/3/135321869/texafuliwurelaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492257/normal_5fa9ffde9a0be.pdfIn PDF document text
    • https://zogeliwev.weebly.com/uploads/1/3/4/3/134353139/kasubupokaxadib-tivujisutototo-xowefikaruko.pdfIn PDF document text
    • https://risegexof.weebly.com/uploads/1/3/4/6/134661868/gepopuxaxek_wozisikaxemux_vagikunomebi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/jilukiwemizi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFE 5112 bytes
SHA-256: 3cf5ec2bcd0d4a4035e3edbc760e1b33badf7026c16c1e772d5c0a68f4f5d57e
font_01_sfnt_off0000ee4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4D 10144 bytes
SHA-256: a987248ba924248d9e5eba4d834a2c4c533b102d9fa7b5c3e5f904b7f9c3d434

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