Malicious PDF — malware analysis report

Static analysis result for SHA-256 e789702be97c8396…

MALICIOUS

PDF

29.7 KB Created: 2020-05-08 01:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e7e1e39f10dc05fa43d55312be7fd395 SHA-1: 38c13d4c2f5c1145dfacb9db3de164130ac8284f SHA-256: e789702be97c8396e9c7c239be56b6549b64fe9a9e1737ac26743a2e9b6b1d6a
96 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, embedding a large number of external URLs. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of numerous links hosted on potentially unrelated domains. The document body contains text related to 'long beach logo vector free' and the wkhtmltopdf application, suggesting a lure to disguise the malicious link distribution. 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://cityonloc.com/uploads/1/3/0/4/130483243/130483243.html#long+beach+logo+vector+free
    • http://rftstart.org/uploads/1/3/0/6/130603802/a9cfa2.pdf
    • http://guantletters.com/uploads/1/3/0/5/130589241/1de2e91ea4a6dc6.pdf
    • http://livewell-dc.com/uploads/1/3/0/5/130588278/6700559.pdf
    • http://haleiwaoutrigger.com/uploads/1/3/0/2/130270996/jaden.pdf
    • http://jeanniesdancefitness.com/uploads/1/3/1/3/131383444/pataresapegovat-kamumominaxofur-pixazok-zuvebiwilam.pdf
    • http://believe-live.org/uploads/1/3/0/5/130588357/dd391692e99.pdf
    • http://contractorsdesktop.com/uploads/1/3/0/2/130273733/kinagototoguwasu.pdf
    • http://rosebudvault.net/uploads/1/3/0/9/130969981/guvodojusigu.pdf
    • http://richardsbestbuildergeneralcontractor.com/uploads/1/3/1/6/131636727/1c5bf500ee08.pdf
    • http://histoires-de-romans.com/uploads/1/3/0/6/130621857/6b02e17.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off00004ae2.bin
d6765964dcc3d249303dc5ab434e8da7dc1d7e87c92c7ff0a1623e82dac13122		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AE2 10028 bytes

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