Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed2f7659b355ac0a…

MALICIOUS

PDF

33.3 KB Created: 2020-04-14 03:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2f8f29c02b15069511b0b25f7cf3c745 SHA-1: 806a3f396f7c1442c8b92566cac65efb9a21abc4 SHA-256: ed2f7659b355ac0ac7360eea940d730ead68fb29f1cb9466aa5fc2f18ccc1ef2
94 Risk Score

Malware Insights

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

The PDF document is identified as malicious by an ML classifier with high confidence. It contains a significant number of external links, many of which appear to be part of an SEO link farm, a common tactic for distributing malicious content or phishing pages. The document body, though partially corrupted, suggests a lure related to job fair interview questions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://elegantcreations.net/uploads/1/3/0/8/130874468/130874468.html#teacher+job+fair+interview+questions+and+answers
    • http://ecobalux.com/uploads/1/3/0/6/130621335/8e3ae86bfb3d7de.pdf
    • http://trayjohnson.com/uploads/1/3/0/3/130379461/luwetu.pdf
    • http://bradfordhincher.com/uploads/1/3/1/3/131379874/8187a1.pdf
    • http://yeseherrajes.com/uploads/1/3/0/5/130543261/1e16ef450aab426.pdf
    • http://molecularmodels.org/uploads/1/3/0/9/130969390/zamulif-kajurixulek-mefufefe.pdf
    • http://flamborospeedwayhalloffame.ca/uploads/1/3/0/7/130739349/0b9253b.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_off00005cfc.bin
70f4b59044989cfd3911a7c4f9c17300e433f7bc71d688c611610a92ebe7be38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CFC 7312 bytes

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