Malicious PDF — malware analysis report

Static analysis result for SHA-256 5273ea7871c54816…

MALICIOUS

PDF

37.5 KB Created: 2020-05-17 13:39:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc49df0aeca1594670bfab125cded113 SHA-1: 846f3da132f198eee95c302682728bc5efddc5de SHA-256: 5273ea7871c54816641e0b55155a87174f17c313d42166afe7f79b94f53cc22c
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs suggest a link farm or redirection scheme, likely intended to drive traffic to potentially malicious sites or for SEO manipulation. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://mohussain.com/uploads/1/3/0/7/130739022/130739022.html#drakensang+the+dark+eye+guide
    • http://roryryanarchitects.com/uploads/1/3/1/4/131406709/05c4a.pdf
    • http://koreyrossmanfit.com/uploads/1/3/0/7/130740455/sibegasulovakepuzud.pdf
    • http://qualitytouchhealthcare.com/uploads/1/3/0/3/130379818/2aa18.pdf
    • http://mymainelydeals.com/uploads/1/3/1/3/131379598/porupemeb.pdf
    • http://justclocks.org/uploads/1/3/1/6/131636834/5345538.pdf
    • http://82classmates.org/uploads/1/3/0/2/130288391/puvod_budod.pdf
    • http://msr2mng.com/uploads/1/3/1/1/131164425/gikabexunelo.pdf
    • http://jerryortizboxing.org/uploads/1/3/0/9/130969418/1692901.pdf
    • http://lionheartlivearts.org/uploads/1/3/0/8/130874389/1be04acb.pdf
    • http://cliftonmcfate.com/uploads/1/3/0/2/130272483/8539b9e5610.pdf
    • http://nileinstitute.org/uploads/1/3/0/2/130289688/9761861.pdf
    • http://bettasetc.com/uploads/1/3/0/2/130288707/528884.pdf
    • http://mococivil.com/uploads/1/3/1/8/131856244/bugurajakobajusesi.pdf
    • http://theloja.com/uploads/1/3/1/1/131164159/tosediv.pdf
    • http://greyday5k.com/uploads/1/3/0/4/130489363/1902998dacb4c.pdf
    • http://farmaciahm.com/uploads/1/3/0/2/130287919/nagusenejisofu-xadiper.pdf
    • http://slohappy.org/uploads/1/3/0/7/130776502/kodowogovupelab.pdf
    • http://purplegirlclothing.com/uploads/1/3/0/3/130323124/ropegag.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_off000065ac.bin
6132f8df99b6252a981b1b0b271b9e8f4c0c0cfde7e0358a394acf6d2d453f51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65AC 10772 bytes

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