Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b4b9bc067c42e8…

MALICIOUS

PDF

36.1 KB Created: 2020-04-04 07:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d54a8c154c4fe1fdb1fdfb97cab33ba0 SHA-1: 1e410a69d1d6bd89a954bd626c254291584b62e4 SHA-256: c3b4b9bc067c42e8a7263f1fb76a304ec200978dc22118a93d060c2f8efbffa9
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this file as malicious. The embedded URLs suggest a link farm or distribution network, likely intended to manipulate search engine results or serve as a landing page for further malicious activity. No scripts were extracted, and the document body was heavily obfuscated.

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://ayurvedaaustralia.org/uploads/1/3/0/7/130775368/130775368.html#witness+and+exhibit+list+sample+minn
    • http://hopetampa.net/uploads/1/3/0/5/130588934/gijoketutogixi.pdf
    • http://alfredspace.com/uploads/1/3/0/7/130775645/kekujirejororoniter.pdf
    • http://body-by-ja.com/uploads/1/3/0/5/130588377/1042977.pdf
    • http://sunflower-sweets.com/uploads/1/3/0/6/130621219/deravon-vulusoba.pdf
    • http://multidimensional-wellness.com/uploads/1/3/1/4/131406662/4299781.pdf
    • http://sassie-travel-destinations.com/uploads/1/3/0/5/130551692/5886262.pdf
    • http://freedomgear.shop/uploads/1/3/0/6/130639774/wikupe.pdf
    • http://lachat2019.com/uploads/1/3/1/1/131164293/4460187.pdf
    • http://thecinnamonkitchen.org/uploads/1/3/0/7/130776786/bosobupo.pdf
    • http://ccmclb.com/uploads/1/3/0/6/130622073/pevinoge.pdf
    • http://iwctogetherwecandomore.org/uploads/1/3/0/4/130476317/nexadiriladozi-nipuwugo-rexozerobo.pdf
    • http://handwarmersstore.com/uploads/1/3/0/7/130775704/daf5e7fe6d83762.pdf
    • http://tabithasdesigns.org/uploads/1/3/0/5/130588732/4947280.pdf
    • http://mickfarm.com/uploads/1/3/0/6/130639895/pokugaxi.pdf
    • http://jalascoaching.com/uploads/1/3/1/0/131069898/zakexigamalevo.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_off0000694b.bin
24dfa735309e8199310961efcc2557694be49fa9350290f5aadd8a0e03c5bcf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x694B 6468 bytes

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