Malicious PDF — malware analysis report

Static analysis result for SHA-256 13984274b7744d28…

MALICIOUS

PDF

30.4 KB Created: 2020-11-06 15:53:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db82c5e3b5812279b692c975aa65b0e4 SHA-1: be671ef782d3b3e2ec56a583330614addd8154b4 SHA-256: 13984274b7744d282cc7bb6221517242f7982c4677b6674b3d9940cc66fd7ac7
96 Risk Score

Malware Insights

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

The PDF document contains embedded links and a "link farm" heuristic firing, suggesting it is designed to redirect users to external websites. The document body text explicitly mentions "Cummins repair manual free download", indicating a lure to download potentially malicious content. The presence of multiple external URIs and the ML classifier's high confidence score support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://traffnew.ru/123?keyword=cummins+repair+manual+free+download
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/tofajiguxejo.pdf
    • https://ririrufazerox.weebly.com/uploads/1/3/4/5/134501654/9753153.pdf
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/aaa73d120d3283a.pdf
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/4999823.pdf
    • https://latenenagizogip.weebly.com/uploads/1/3/2/6/132696064/4fc27ce5c2.pdf
    • https://cdn-cms.f-static.net/uploads/4415782/normal_5f98779f13663.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ralejub.files.wordpress.com/2020/11/io2f2_lewis_structure.pdf
    • https://s3.amazonaws.com/mubemutolewe/capitales_des_pays_africains.pdf
    • https://s3.amazonaws.com/divelatoxa/82360641988.pdf
    • https://s3.amazonaws.com/zunewidimem/3545362936.pdf
    • https://s3.amazonaws.com/rotowan/21240036290.pdf
    • https://s3.amazonaws.com/viboxikuz/64351126413.pdf
    • https://s3.amazonaws.com/batoragubukepo/tevos.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_off00003f7f.bin
c1b72010c9de9378c8790b9b1e28fcdb54f1ed42711693135459dcd86948792c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3F7F 5184 bytes
font_01_sfnt_off0000511b.bin
96140241d9104841fbe51f546d6279d2e22062b5c93d0d228ed39c6794a1294f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x511B 8152 bytes

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