Malicious PDF — malware analysis report

Static analysis result for SHA-256 d49a7f6d41e9f587…

MALICIOUS

PDF

37.1 KB Created: 2020-04-02 08:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2db3541023a67c8ec347d07b2e5128fd SHA-1: 50d7ea8cb62e2f90de7981e3cf023e63f8eb665a SHA-256: d49a7f6d41e9f5870fdbd8ff180debf8fbe605f464503c83d59ca72301fa9c96
94 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links to external websites, a common tactic for SEO link farms or phishing campaigns. The document body, though partially corrupted, suggests a lure related to "Corvette c5 parts diagram". The heuristic PDF_SEO_LINK_FARM firing indicates a high volume of external links, likely intended to manipulate search engine rankings or direct users to malicious content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://southerntierpremiumdetailing.com/uploads/1/3/0/8/130814283/130814283.html#corvette+c5+parts+diagram
    • http://merwininsurance.net/uploads/1/3/0/6/130620230/3901738.pdf
    • http://oniceshoes.com/uploads/1/3/1/3/131379518/92ee2.pdf
    • http://neutralskincare.com/uploads/1/3/0/6/130639712/be8dd65bf.pdf
    • http://nefryder.com/uploads/1/3/0/7/130775851/1348511.pdf
    • http://finelineapplications.com/uploads/1/3/1/3/131379965/a4a6d826b8.pdf
    • http://churchofchrist-petersburgva.org/uploads/1/3/0/8/130814510/1266968.pdf
    • http://dillardberg.com/uploads/1/3/1/1/131163858/771795.pdf
    • http://soullinks.org/uploads/1/3/0/6/130620297/892f14e.pdf
    • http://labellaristorantelees.co.uk/uploads/1/3/0/7/130776523/wepolorik.pdf
    • http://jaredbilly.com/uploads/1/3/0/4/130483772/1489731.pdf
    • http://053748270.com/uploads/1/3/0/5/130547024/tepon.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_off000067c1.bin
38a78106b4b540a5536cb91fe9c488126db7520d6aea624c2a5740ab75f069b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67C1 8132 bytes

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