Malicious PDF — malware analysis report

Static analysis result for SHA-256 f667cc6b4e83ee0a…

MALICIOUS

PDF

34.4 KB Created: 2020-04-06 07:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 36e530cc4ad5a0f85573aaa019e3f743 SHA-1: 2bdb3badf05719dfe3671ae12c6344616864a0fb SHA-256: f667cc6b4e83ee0abf79427bb8bad843e1e24fddd7796393be27ede0fb255623
94 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 similarly structured URLs on different domains. This pattern is indicative of a link farm or SEO spam campaign, designed to drive traffic to various sites. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted from this sample.

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://aboveandbeyondscaffolding.com/uploads/1/3/1/0/131070774/131070774.html#dyson+v6+motorhead+brush+bar+motor+assembly
    • http://maderauna.es/uploads/1/3/0/5/130590047/3204019.pdf
    • http://thehclf.org/uploads/1/3/1/1/131164398/3ee9051edba75fa.pdf
    • http://360-advertising.com/uploads/1/3/1/0/131069921/rawipi.pdf
    • http://thriveandnourish.com/uploads/1/3/0/8/130813798/kabibatanojope.pdf
    • http://gsopaintingservices.com/uploads/1/3/0/5/130589097/a89fdf8.pdf
    • http://providafitness.com/uploads/1/3/0/6/130620515/semek.pdf
    • http://stcroixdigitalmarketing.com/uploads/1/3/0/6/130604778/ed4bb22c5ed.pdf
    • http://davediamond.info/uploads/1/3/0/7/130739772/5180438.pdf
    • http://valleyevictions.com/uploads/1/3/0/7/130738482/bofagepejoto_polimozubafikol_kiwafoxiz_fofitubofada.pdf
    • http://atrc-spc.net/uploads/1/3/0/4/130489019/lewopa.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_off00005df6.bin
55d99a11ab64c0591594ceb23ebca31bc3a19159a404b37968af2bef70b98006		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DF6 7972 bytes

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