Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f0b72053ea289f…

MALICIOUS

PDF

58.0 KB Created: 2020-04-11 04:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e451e78a6b0a09a3d009740203393467 SHA-1: cdc8600d7e7176c90f35c6873d97400353617924 SHA-256: e1f0b72053ea289ff953e624c3389bd0a799d9d6d3c1c7f7b1213525b809fa49
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains, suggesting a link farm or SEO spam tactic. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure, directing users to a potentially malicious HTML page. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://thehappygirlstore.com/uploads/1/3/1/3/131383958/131383958.html#felipe+tena+ramirez+derecho+constitucional
    • http://westmicleaning.com/uploads/1/3/1/1/131164519/ribexepi.pdf
    • http://6monthsatatime.org/uploads/1/3/0/6/130621276/a06a7097.pdf
    • http://therapyindubai.com/uploads/1/3/0/2/130292098/2797729.pdf
    • http://vogelindustries.com/uploads/1/3/1/4/131409546/wagizape.pdf
    • http://mpdkiddiekamp.com/uploads/1/3/0/4/130477026/wezifanatavelesotu.pdf
    • http://kokoonmi.fr/uploads/1/3/0/6/130639668/jimedukekalo_memorosorikofi_marumakiko.pdf
    • http://davetamblyncoaching.com/uploads/1/3/0/6/130640090/c7c97eb.pdf
    • http://haydenshaven.net/uploads/1/3/0/6/130639506/jazede.pdf
    • http://dukun-santet.com/uploads/1/3/0/9/130969806/8073640.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009762.bin
bf9b1bbac3182d9db2bbe2bc1780b80320e930b18c3a7916e24476d408f0f332		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9762 10076 bytes
font_01_sfnt_off0000bb19.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB19 2652 bytes
font_02_sfnt_off0000c47f.bin
977dbd173eca1f4f1417373ba8176450f89b7ca8e405274873b978f413fec4f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC47F 16068 bytes

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