Malicious PDF — malware analysis report

Static analysis result for SHA-256 0139119be7efa2eb…

MALICIOUS

PDF

32.4 KB Created: 2020-06-18 07:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebf65c2bf0011f44d8d70869e43d367a SHA-1: 214a3e56b39bdd3ca44727ceed07cf1a72d7c30c SHA-256: 0139119be7efa2eb0d8d9936d91f336e6a203d335f4bc5f1018581f6482bad08
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body also contains embedded URLs, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness, likely related to the distribution of malicious content or phishing through these numerous links.

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://everbuilt.net/uploads/1/3/0/2/130272296/130272296.html#engineering+mechanics+dynamics+hibbeler+solutions+manual
    • http://thebrilliantminute.com/uploads/1/3/1/3/131380447/muzifediwagunom.pdf
    • http://jozibestwomensclinic.com/uploads/1/3/0/6/130605122/e4ebe.pdf
    • http://iamdegoat.com/uploads/1/3/0/6/130639709/d2be04eee21e35.pdf
    • http://kimballcabinets.com/uploads/1/3/0/7/130775679/visubixo-lopeguzirugim-lipudifu-ketuf.pdf
    • http://ecuriebarnton.com/uploads/1/3/0/7/130739260/7088533.pdf
    • http://mail.fatherjim.com/uploads/1/3/0/8/130874629/50f821448a331c.pdf
    • http://acinomunited.com/uploads/1/3/0/5/130588858/205ab49be.pdf
    • http://nemomax.net/uploads/1/3/0/5/130551720/f7717663d999d57.pdf
    • http://vcvids.com/uploads/1/3/0/2/130273610/fupamugorakine_bazekidut.pdf
    • http://janinep.com/uploads/1/3/1/6/131606502/velunuturezit-judubunekujegub-guguvu.pdf
    • http://lra.org/uploads/1/2/9/4/129455080/129455080.html?vintage
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000465a.bin
6d4bdd14726094516f5a62f5b738d6e645c17fc30a8b584cdb83c45b39cef1c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x465A 5436 bytes
font_01_sfnt_off0000589b.bin
033f9c4129c21db2c070bb9893b7fe738a146817e3747331fb03524bd7c4bbf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x589B 8416 bytes

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