Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3035fa6af01dbed…

MALICIOUS

PDF

35.6 KB Created: 2020-04-06 06:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1fcda191c797157831d274ae7bc8b7d2 SHA-1: 0900e43e5da2badaab28c9f7fb4a4c5c2328c4ba SHA-256: f3035fa6af01dbede09d96785676e32c4d6b53af60277bc9b8097f80f98658a4
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to similarly structured URLs on various domains. The document body, though partially corrupted, suggests a lure related to programming problem-solving. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm designed to manipulate search engine results, likely to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://thehnossaproject.com/uploads/1/3/1/3/131383949/131383949.html#pasos+para+resolver+problemas+en+programaci%C3%B3n
    • http://nicoleharrislaw.com/uploads/1/3/0/6/130620868/63c4df79ff3.pdf
    • http://bouncezone.nl/uploads/1/3/0/4/130489157/3274541b39cdce6.pdf
    • http://cobcommunity.com/uploads/1/3/0/6/130621954/jafakolisog-xikejaxabu-gubifi.pdf
    • http://brigitte-puschmann-studio.com/uploads/1/3/0/4/130476885/notatilo-dibatodeponepow.pdf
    • http://mainospyloni.com/uploads/1/3/0/3/130313006/8632627.pdf
    • http://anitasdecals.com/uploads/1/3/1/1/131163660/mopuragenozev.pdf
    • http://stevenstrekking.com/uploads/1/3/0/5/130539229/neguxaz.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_off00006143.bin
061def89f7e98a9a46dcfa969c4511ac3d71267c76fdfcede784fa8f763a7ee4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6143 8352 bytes

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