Malicious PDF — malware analysis report

Static analysis result for SHA-256 45c2c07a3b00a7db…

MALICIOUS

PDF

39.2 KB Created: 2020-06-12 09:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 281bd0fe467e5b7d8866c2c982d8af10 SHA-1: ff222fbd386c58c5c4a490210acbe51e1b8d9487 SHA-256: 45c2c07a3b00a7dbc413539b2c6eb434ed421b4a35f3d74204a5a8ac9ea9400e
96 Risk Score

Malware Insights

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

The PDF document employs a link farm technique, embedding numerous external links to various domains. The primary lure appears to be "Book of burger pdf", directing users to potentially malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass external link farm, suggesting a delivery mechanism for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://mikewolfcom.com/uploads/1/3/1/4/131454656/131454656.html#book+of+burger+pdf
    • http://theemeraldstone.net/uploads/1/3/0/6/130604690/b527a9f5f.pdf
    • http://webmail.soybeanessentials.com/uploads/1/3/0/6/130605034/a10f8c942c1.pdf
    • http://hvv-ovm-aalst.be/uploads/1/3/0/2/130289620/3601687.pdf
    • http://tonygezziportfolio.com/uploads/1/3/0/7/130775743/7228433.pdf
    • http://cpanel.whlaw.com/uploads/1/3/0/6/130605388/1960361.pdf
    • http://chilliart.com.au/uploads/1/3/1/6/131637176/585921.pdf
    • http://starspangledbabe.com/uploads/1/3/0/8/130813601/8867b9bf7.pdf
    • http://procreditsol.com/uploads/1/3/1/8/131871426/8284271.pdf
    • https://kegitefivoxu.files.wordpress.com/2020/06/67445148458.pdf
    • https://jejasefepu.files.wordpress.com/2020/06/51310372569.pdf
    • https://diwuvogodun.files.wordpress.com/2020/06/madusapujugeseledegab.pdf
    • https://nojisaxopo.files.wordpress.com/2020/06/bonija.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_off00006b92.bin
55e4f19ba8ac08f670ee3d5d1aaa958376253679ff8686e537a89ea8e31542f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B92 11288 bytes

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