Malicious PDF — malware analysis report

Static analysis result for SHA-256 67b5df9ee0eedadb…

MALICIOUS

PDF

66.0 KB Created: 2020-06-15 01:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0722db93ba95ba7d930280715aaa1e66 SHA-1: 9e5e83798d301ff37966830cf8e5d343d2145390 SHA-256: 67b5df9ee0eedadbb7fcb923805ed6cedaa5b9561f1b14c7bd522fa94722cb6d
96 Risk Score

Malware Insights

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

The PDF document is identified as malicious by an ML classifier and contains a large number of external links, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristic firings indicate a potential for malicious redirection or content delivery. The document's content is presented as interview questions, a common lure for phishing or malware distribution.

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://centerforregenerativeculture.org/uploads/1/3/0/6/130620228/130620228.html#gis+interview+questions+and+answers+pdf
    • http://theatteberrys.com/uploads/1/3/1/1/131164021/1317527.pdf
    • http://nurturingnursery.com/uploads/1/3/0/6/130620265/9979127.pdf
    • http://kallanscommunity.org/uploads/1/3/1/4/131454012/92216.pdf
    • http://mattisonspeedwerks.com/uploads/1/3/0/8/130873779/jawetezopiduwuwuf.pdf
    • http://74-123-76-128.mgwnet.com/uploads/1/3/0/6/130604416/2213817.pdf
    • http://theknowledgewithin.com/uploads/1/3/0/8/130874339/a61d894bc.pdf
    • http://seelysound.com/uploads/1/3/0/3/130379352/781013.pdf
    • http://hawaiibachataexpo.com/uploads/1/3/1/8/131857590/f0cf34a452.pdf
    • http://fleshandbloodfantasy.com/uploads/1/3/0/4/130476740/5cf38a5.pdf
    • http://ciphertrust.r3nets.com/uploads/1/3/0/2/130287842/waxutimibi_fobewazogam_xizof_wagaxilimadixut.pdf
    • http://globaltransfer.net/uploads/1/3/1/8/131872295/vozufeze.pdf
    • http://turnkeyrealityrealty.com/uploads/1/3/0/4/130483578/nifatozerig.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://pitekule.files.wordpress.com/2020/06/difaxizepuzuwaruzuxo.pdf
    • https://ribodijexob.files.wordpress.com/2020/06/11505389700.pdf
    • https://kosezupawi.files.wordpress.com/2020/06/nisusosederomajixezu.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_off0000ccad.bin
c47328b99d1a8106722297ddf3976446a0c29354b3be907203f77db8ad888c37
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAD 1684 bytes
font_01_sfnt_off0000d50e.bin
cdb3f0f7ad2406b6d3ffba960fbbb6f8e5091cef82c547fbd5ee34459b346958
pdf-font-stream PDF embedded font (sfnt) at offset 0xD50E 11420 bytes