Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0dda0ff12c8d9ee…

MALICIOUS

PDF

33.1 KB Created: 2020-05-16 09:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f2f7f1d17bcdcc6ae026213223426d3 SHA-1: 862052131f17772c7680e9cc6ecaaba0eae0abcc SHA-256: c0dda0ff12c8d9ee03bcdd89ba3f1195e150e579cb62117c4aba43bbc28eb73c
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files hosted on various domains. This pattern is indicative of a link farm or SEO manipulation tactic, likely intended to either distribute malware or engage in phishing. The ML classifier strongly supports the malicious nature of this document. No scripts were extracted, and the document body is heavily obfuscated, making it difficult to determine a more specific attack pattern.

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://youbrewchicago.com/uploads/1/3/0/4/130483795/130483795.html#guindy+industrial+estate+guideline+value
    • http://still-mainstream.com/uploads/1/3/0/7/130776795/0193b3d176db.pdf
    • http://maximizedwealthmg.com/uploads/1/3/0/2/130270899/zekafabeni.pdf
    • http://yankeereaders.com/uploads/1/3/1/4/131437307/domuzamafotepok.pdf
    • http://qualityfinancialsolutions.net/uploads/1/3/1/4/131410736/8826436.pdf
    • http://chocolatekandii.com/uploads/1/3/1/3/131383476/7776339.pdf
    • http://acaihut.com/uploads/1/3/0/8/130814630/vemuzu.pdf
    • http://iqfacilityservices.net/uploads/1/3/0/8/130873875/0b200a179b1.pdf
    • http://traceyrossi-portfolio.com/uploads/1/3/0/2/130271211/bofuguv.pdf
    • http://sentrymirrors.com/uploads/1/3/0/8/130873864/3730b826aa034.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_off00005665.bin
a8e223a5d3cb92fea496d8d18a4c63e35624e590fd2b22f105a006d3cc9a681d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5665 10300 bytes

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