Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0126b024dbfafbb…

MALICIOUS

PDF

36.8 KB Created: 2020-04-05 11:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0ae70043c84b344e1a007d70003cf7d0 SHA-1: f26958d387d4005928fc65558851958116f9eb68 SHA-256: b0126b024dbfafbb069d1593b578ad6d24f13210dfffce92ed2df7dedf7b5540
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on unrelated domains, indicating a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious. The embedded URLs are likely used to redirect the user to malicious content or download further payloads.

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://cyclebavaria.com/uploads/1/3/0/7/130775753/130775753.html#modern+automotive+technology+workbook
    • http://parktutoring.net/uploads/1/3/0/7/130776279/wasuk.pdf
    • http://fulltimecasual.com/uploads/1/3/0/5/130550797/ravijisoxonununu.pdf
    • http://fbclee.net/uploads/1/3/0/5/130590673/zesuzezuxemeso-lojeb.pdf
    • http://crafterafterhours.com/uploads/1/3/0/7/130739260/45d77703c6eee.pdf
    • http://electricfairness.com/uploads/1/3/0/7/130776447/tekexegowiwu-savokad.pdf
    • http://avenueapartments.gr/uploads/1/3/1/4/131452950/nazopanuzotuj.pdf
    • http://evbossguide.com/uploads/1/3/1/4/131407492/lifokebuwuminu.pdf
    • http://damiandineen.com/uploads/1/3/0/6/130604181/3588495.pdf
    • http://ourlighthousecommunity.org/uploads/1/3/0/6/130604500/lavivupunukokufal.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_off0000692a.bin
4f81934a0b4bc5f160cf01362ea2f843e5ef6c543693c248076f49e3e726ece3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x692A 7548 bytes

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