Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf26793013e3933c…

MALICIOUS

PDF

84.4 KB Created: 2020-11-07 13:30:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c7c0b1b0e2948b3bffd8bd23ecd6d2dc SHA-1: 1cf0006b4faec45714353d577aacafae3cf6352c SHA-256: bf26793013e3933c2c7d5aa51d9711eb75f432bc1359290ba4702ada9f2d3755
166 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded external links, indicating a link farm or SEO manipulation tactic. The presence of 'CMd�EE̺X�' in the document body suggests an attempt to disguise or obfuscate commands, potentially related to executing malicious actions or redirecting users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://trafffe.ru/123?keyword=dee+shaw+actress+ga PDF link annotation
    • https://zipazoraxegav.weebly.com/uploads/1/3/4/3/134325660/vowazilij_rovoraguwomato_bituremaz_megazenipodo.pdfIn macro / runtime command snippet
    • https://cdn-cms.f-static.net/uploads/4416810/normal_5f97df3e3c9f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377391/normal_5f8bd37b7079a.pdfIn PDF document text
    • https://kaxokotul.weebly.com/uploads/1/3/4/3/134380066/2630657.pdfIn PDF document text
    • https://geredape.weebly.com/uploads/1/3/4/3/134349068/035abc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377663/normal_5f93135fd40b1.pdfIn PDF document text
    • https://relulime.weebly.com/uploads/1/3/4/3/134384492/gewatirizir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://sorenuj.files.wordpress.com/2020/11/29785498416.pdfIn PDF document text
    • https://sisiviweze.files.wordpress.com/2020/11/50939477702.pdfIn PDF document text
    • https://rezowus.files.wordpress.com/2020/11/sukesifovupif.pdfIn PDF document text
    • https://rovamidenube.files.wordpress.com/2020/11/manual_de_servicio_toyota_tercel_1993.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d54bc178-9f57-4545-82a7-bb3a06c9936e/michael_goggins_facebook.pdfIn PDF document text
    • https://nijubar.files.wordpress.com/2020/11/75846096254.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
    • https://sorenuj.files.wordpress.com/2020/11/29785In macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F18 5120 bytes
SHA-256: 9b78dd82118e13164afab4e8dd0f1fa900a19840a515c254d797267658a22ff9
font_01_sfnt_off00012097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12097 10860 bytes
SHA-256: 4e59b3e7ac19a0a2f2f10281dc5fa8d1283d808356cdf7144f7ac2648af01f4f

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