Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a376590aab2961…

MALICIOUS

PDF

55.9 KB Created: 2020-06-14 22:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ea9faac2a9b2a5c9c06f3627bb8cbbc SHA-1: 4dce01cde320aa7125b7d03044bb91804e5f78ac SHA-256: 45a376590aab2961c3259470ab7589c025246235faabaf7d40b7efa6c947a00a
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links, many of which point to domains designed to mimic legitimate content or appear as generic file hosting. The heuristic PDF_SEO_LINK_FARM indicates a deliberate attempt to create a link farm, a common tactic for SEO manipulation or to host malicious content. The embedded URL in the document body, 'http://1cj.undesirable.us/uploads/1/3/1/8/131856703/131856703.html#boise+local+tv+guide', suggests a lure related to local content to entice clicks. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 http://1cj.undesirable.us/uploads/1/3/1/8/131856703/131856703.html#boise+local+tv+guide
    • http://my-brad-lisa-memories.com/uploads/1/3/0/7/130739167/roker.pdf
    • http://empirefashion.net/uploads/1/3/0/6/130621527/gavafepexojiw.pdf
    • http://thanakorn-phattharaboorapha.com/uploads/1/3/1/3/131381046/banukif.pdf
    • http://cisisposa.com/uploads/1/3/0/5/130589050/kameridofufix.pdf
    • https://puvudoxewe.files.wordpress.com/2020/06/zodoveteterejonakije.pdf
    • https://varesewivoja.files.wordpress.com/2020/06/3954794522.pdf
    • https://kajunomifoj.files.wordpress.com/2020/06/dagotufoxumob.pdf
    • https://jewifafubod.files.wordpress.com/2020/06/90585558149.pdf
    • https://dadisegikew.files.wordpress.com/2020/06/29646558993.pdf
    • https://noratum.files.wordpress.com/2020/06/80954285565.pdf
    • https://gofifod.files.wordpress.com/2020/06/kefunetipe.pdf
    • https://lanupobigel.files.wordpress.com/2020/06/48995843087.pdf
    • https://zaguzewurufo.files.wordpress.com/2020/06/46074291459.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad44.bin
5fe0be3de6ea95d72800f056f20a647300fa48f97cd4af117f749f70cc483053		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD44 11776 bytes

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