Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e74dee12755a9d9…

MALICIOUS

PDF

40.5 KB Created: 2020-03-23 04:23:32 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c7028af62ed0aad3be844ac751082bd6 SHA-1: cb9802f64cef516fad4f5d530e7a27d30e808e89 SHA-256: 3e74dee12755a9d9f2bea52189e0735e36a67c4669d4ef6e51d2dbdf104250d6
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or distribution network. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the sheer volume of outbound links points to a malicious intent, likely to manipulate search engine results or distribute further malware.

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 http://volunticity.com/uploads/1/3/0/3/130323401/130323401.html#la+tierra+canta+barak+letra+completa
    • http://transportboatyacht.com/uploads/1/3/0/4/130436439/wudixegoket.pdf
    • http://bluemonsterservice.com/uploads/1/3/0/6/130605030/8849994.pdf
    • http://marklich.com/uploads/1/3/0/5/130588287/179904.pdf
    • http://www.conservationknowledge.org/uploads/1/3/0/2/130288883/zebogekom_texenejo_larakumudorage_tanana.pdf
    • http://jjpinternalmedicinegroup.com/uploads/1/3/0/2/130287895/nupetuz.pdf
    • http://northshorepersonalcoaching.sydney/uploads/1/3/0/5/130551554/d98292e388c96.pdf
    • http://www.snowyelkcorp.com/uploads/1/3/0/6/130620651/kutawuve_zuparijabuwozub_jakazosamipamux_gipajum.pdf
    • http://thisfancyyarn.com/uploads/1/3/0/2/130288453/792d8ed6b226039.pdf
    • http://montanahorsesandmules.com/uploads/1/3/0/4/130477110/9147726.pdf
    • http://www.bjpropertyventures.com/uploads/1/3/0/3/130323232/xuwotivigumo-lejolelekawesok-wukowatu-setelawapipu.pdf
    • http://www.ismelo.com/uploads/1/3/0/5/130588542/2062643.pdf
    • http://lakescary.com/uploads/1/3/0/7/130775651/dfd4a.pdf
    • http://soldelcaribe.org/uploads/1/3/0/4/130489143/jifodutunaxaru_dufalu.pdf
    • http://home-cyber-protect.com/uploads/1/3/0/6/130620947/5566093.pdf
    • http://lifewithattitude.net/uploads/1/3/0/3/130323377/mokuw.pdf
    • http://marciamoultonmediator.com/uploads/1/3/0/4/130488498/bajojugumorike_fibuxuzotow_kojebadom_vexasuvuded.pdf
    • http://battle-buddies.net/uploads/1/3/0/2/130270932/vitiwebe.pdf
    • http://mibulls.org/uploads/1/3/0/5/130543353/3997573.pdf
    • http://oliviarushdesign.com/uploads/1/3/0/3/130323597/6561896.pdf
    • http://rbuels.org/uploads/1/3/0/4/130476135/aa402be12de6ec.pdf
    • http://medhoff.com/uploads/1/3/0/6/130640057/4292532.pdf
    • http://www.longislandnailtech.com/uploads/1/3/0/7/130739174/d642615.pdf
    • http://www.longislandnailtech.com/uploads/1/3/0/7/13073917
    • http://treffitblogi.suomi24.fi/uploads/1/3/0/8/130873994/6108864.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_off00006fd5.bin
febaad6c23bbfabd4750539bcfe4dfe210d067ced66b02e21a0d66bfbabbc531		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FD5 9608 bytes

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