Malicious PDF — malware analysis report

Static analysis result for SHA-256 460de5d6d806c4be…

MALICIOUS

PDF

36.6 KB Created: 2020-04-19 04:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dcf48680505cf93177bf61cf464e5547 SHA-1: dc86c93184c217258e131e91f22210968d822ca0 SHA-256: 460de5d6d806c4be855518da21db3ae10a89363140a6d7ad13ebceb078047131
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, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or distribution mechanism. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated but contains URLs that are likely part of this link farm. No scripts were extracted, limiting the analysis of direct payload execution.

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://policetrailer.com/uploads/1/3/0/3/130323412/130323412.html#bluebook+case+citation+short+form
    • http://billvardeman.com/uploads/1/3/1/6/131606228/lobejonanexu.pdf
    • http://pashlethbancorp.com/uploads/1/3/1/3/131398598/2506069.pdf
    • http://monicarayscott.com/uploads/1/3/0/8/130813966/linoje.pdf
    • http://osteo-tarare.com/uploads/1/3/0/4/130483766/be0522fcb294a.pdf
    • http://sercantasgin.com/uploads/1/3/0/4/130436513/20d4704.pdf
    • http://bitsbridlesbrambles.com/uploads/1/3/0/3/130323488/vevofurulukelute.pdf
    • http://fruitsnblooms.ca/uploads/1/3/0/6/130620542/xekowupemagob-labaxas-nujede.pdf
    • http://childrensdigitalfuture.com/uploads/1/3/1/4/131437149/mimodekala-ponekati.pdf
    • http://grayskyblue.com/uploads/1/3/0/5/130541904/1048789.pdf
    • http://line-daily.com/uploads/1/3/0/7/130739015/magivujewi.pdf
    • http://salmoncommander.org/uploads/1/3/0/2/130271150/8371551.pdf
    • http://botoxbuyersguide.com/uploads/1/3/0/9/130969428/4669007.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_off000065b2.bin
b096a17ce10080d2222889458e9a85591687d2b62b54ac4eaca79367b51d2a48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65B2 8084 bytes

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