Malicious PDF — malware analysis report

Static analysis result for SHA-256 12e07695b7661850…

MALICIOUS

PDF

35.3 KB Created: 2020-04-11 10:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 88360fb921a01e1ad864b55c022e2ac8 SHA-1: 9bdd8643647168272f22c0ee71604c088f8ae6ed SHA-256: 12e07695b7661850c6095940fc7c6e94f0ca39738fca16ab8ef693f6fa80ad49
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The embedded URLs point to various PDF files hosted on unrelated domains, indicating a potential distribution network for malware or phishing content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cww60.bpmtc.com/uploads/1/3/0/3/130313336/130313336.html#evolution+2nd+edition+bergstrom+pdf+free+download
    • http://southdakotabankingcareers.com/uploads/1/3/0/4/130435795/59dea075c8dcd09.pdf
    • http://exsolution.net/uploads/1/3/0/2/130272649/1607764.pdf
    • http://malignantbeats.com/uploads/1/3/0/6/130604421/9113743.pdf
    • http://keystonetaildraggers.com/uploads/1/3/0/8/130874523/5763318.pdf
    • http://kakeibo.eu/uploads/1/3/1/4/131453540/5d6cd1bdab004.pdf
    • http://admirableembroidery.com/uploads/1/3/0/5/130550961/7654740.pdf
    • http://drkennethwainwright.com/uploads/1/3/0/4/130483271/cb20b4b507c36.pdf
    • http://earthworkstilestone.com/uploads/1/3/0/6/130621413/wesuguv.pdf
    • http://knowlesfamilycounselling.info/uploads/1/3/1/3/131384336/34cd54.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_off00005f39.bin
729700c0d9d1352edae3f5c513afd3a27245fa00a0569d877e2582b011754833		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F39 8852 bytes

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