Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc1eb0758062b46…

MALICIOUS

PDF

41.9 KB Created: 2020-04-24 21:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 6e15b264ff5c849db6f777aa66517074 SHA-1: 824d3aafba7b1a051e0a8ca1fc703808e15fa1f0 SHA-256: 0fc1eb0758062b4666c4054472195c34124c580cd93364594ec498057a17949c
96 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 other PDF files hosted on similar domains. This behavior is indicative of a link farm or a method to distribute malicious content indirectly. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine a more specific attack pattern beyond link manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://thehnossaproject.com/uploads/1/3/0/2/130291371/130291371.html#big+w+job+application+form+pdf
    • http://weselftow.com/uploads/1/3/1/4/131482850/2963323.pdf
    • http://tristarwestregion.com/uploads/1/3/0/7/130739525/f5075554.pdf
    • http://doobynuggets.com/uploads/1/3/0/9/130969800/foduramubeluno.pdf
    • http://agewellfinancial.net/uploads/1/3/1/3/131398027/fomidufi-batobimowa.pdf
    • http://draftechcad.com/uploads/1/3/0/6/130639574/9533338.pdf
    • http://verticalcreations.shop/uploads/1/3/0/5/130539875/kolix-lonuladubakoga-sotoja.pdf
    • http://utabletennis.com/uploads/1/3/0/3/130379651/fab1f909044ee.pdf
    • http://torcontracting.net/uploads/1/3/0/3/130379461/somiseb_jonogef.pdf
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007022.bin
00c23ede35a8a9fff0c2e8ad9c56fdb71a24e8f890a3c7fb46ebf5d065275471		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7022 8580 bytes
font_01_sfnt_off000090b9.bin
d907c570f1f8f2d62f38d7529dbf77de46ca3a1917ec53aca7a78bae59874b04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90B9 2616 bytes

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