Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d79470851830a1…

MALICIOUS

PDF

29.5 KB Created: 2020-04-04 09:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: df6d0a9af83e1ccd5d158b44a4cd80a1 SHA-1: a69a9efd8e1b6de11160a0ff507945eb83020e1a SHA-256: a6d79470851830a1edc818e4e71e8715556e7d5c77ac810b0d07fecd19c89b95
96 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, a technique often used for SEO spam or to redirect users to malicious sites. The PDF_SEO_LINK_FARM heuristic firing confirms this behavior, indicating a mass of external links. The ML_NYX_PDF_MALICIOUS score further supports the malicious nature of the file. No scripts were extracted, and the document body is heavily obfuscated, but the presence of numerous external links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://polynesian-properties.com/uploads/1/3/1/3/131379655/131379655.html#craftsman+315+garage+door+opener+manual
    • http://paulorobertonutricionista.com/uploads/1/3/0/6/130604231/874961.pdf
    • http://sharonclemmonsthomas.com/uploads/1/3/0/2/130271219/mejalalope_zujax.pdf
    • http://benjaminbalexander.com/uploads/1/3/0/5/130550827/0e6ee4c1f337d1.pdf
    • http://rootsphillyyoga.com/uploads/1/3/0/5/130543488/wabetuviwizon_tunavodema_likuxo.pdf
    • http://newyouth8.org/uploads/1/3/0/8/130873796/4233744.pdf
    • http://q1realty.com/uploads/1/3/0/4/130436473/4796987.pdf
    • http://qgpivoj.sites.looka.com/uploads/1/3/1/3/131378852/jusipafuropen-kibalut-nazurawelofi.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_off00004d80.bin
e09830ba4d4e250d2762af7249909bf30dd27aaed74b43c18ee2b1ad5b707349		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D80 6996 bytes

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