Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5715df42fb8cb5…

MALICIOUS

PDF

37.2 KB Created: 2020-06-24 21:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 083e24b71725d205e23fbfd495033cb3 SHA-1: 7d917f1aed3f0ced5352632dee0014529394f063 SHA-256: 3d5715df42fb8cb58ea26507ce892eed73f4e3bb9438fa29ffd32097e29f0470
94 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier as malicious with high confidence. It contains a significant number of external links, many of which point to domains structured similarly to SEO link farms, suggesting a tactic to distribute malicious content or phishing lures. The presence of the URL http://mail.renosalsa.com/uploads/1/3/1/6/131636814/131636814.html#moon+acl+rehabilitation+guidelines within the document body further supports this attack pattern.

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://mail.renosalsa.com/uploads/1/3/1/6/131636814/131636814.html#moon+acl+rehabilitation+guidelines
    • http://regattacanecorso.com/uploads/1/3/0/9/130969259/404849.pdf
    • http://survivalland.com/uploads/1/3/2/6/132681281/412de7.pdf
    • http://huntercrafts.com/uploads/1/3/0/7/130738615/1b7fa38ee8989.pdf
    • http://cornerpockettraders.com/uploads/1/3/1/4/131407530/riwesuterig.pdf
    • http://robblick.adviser.live/uploads/1/3/1/3/131381450/wapufi-gewuviruleret-xelujuruxuza.pdf
    • http://hostmaster.paris-museum.de/uploads/1/3/1/4/131454427/munobaku.pdf
    • http://countrythelabel.com.au/uploads/1/3/0/2/130289595/sazawamo.pdf
    • http://yonatan199.octarinesec.com/uploads/1/3/0/6/130603896/aeda8871ccfceea.pdf
    • http://scuolaecomskbo.net/uploads/1/3/0/2/130273584/3903340.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000528c.bin
e5390549f5fdd3bc2494586e89b7b501e5215a6a5c151a4f5b6b416378662467		 pdf-font-stream PDF embedded font (sfnt) at offset 0x528C 5228 bytes
font_01_sfnt_off00006446.bin
544c60e0b416ab3bc79fe52bd28bf1d7efaf7f5094105397eb1e8ab6260791ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6446 10644 bytes

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