Malicious PDF — malware analysis report

Static analysis result for SHA-256 2137950608d02252…

MALICIOUS

PDF

36.8 KB Created: 2020-03-16 00:51:20 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 16c9fce21e7068ad5233221512b24ef5 SHA-1: a10e8477150b88e4ae13e4f9b98010dc629cd5dc SHA-256: 2137950608d022524da37de271016f0928cf151fe98f1bd235fa2c319846d357
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. The document body text is heavily obfuscated but contains references to URLs that are also present in the heuristics, suggesting a coordinated effort to link to a network of related PDF files.

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://nationals2020.com/uploads/1/3/1/0/131070247/131070247.html#sql+server+format+code+management+studio
    • http://www.info.wir-kaufen-garagen.de/uploads/1/3/0/3/130379523/pufegidazu.pdf
    • http://autodiscover.radarresearch.com/uploads/1/3/0/2/130288731/a272dd7b3dc9.pdf
    • http://in-sourcing.com/uploads/1/3/0/2/130288533/f7670ba6dcc.pdf
    • http://thesummervillegroup.biz/uploads/1/3/0/7/130775868/7c68c.pdf
    • http://prepboys.net/uploads/1/3/0/3/130323822/mugad.pdf
    • http://www.instantimprintsroswell.com/uploads/1/3/0/4/130483384/4978320.pdf
    • http://www.lamariposalocapr.com/uploads/1/3/0/5/130551754/vofowixetuzup.pdf
    • http://www.susieschoonmaker.lynn-gustafson.com/uploads/1/3/0/8/130813448/62524f86.pdf
    • http://prodsquad.net/uploads/1/3/0/7/130738875/9bf2fd33d8bc32a.pdf
    • http://nelliejelly.com/uploads/1/3/0/6/130620788/6952356.pdf
    • http://272097760920155322.com/uploads/1/3/0/8/130874146/d9271ee1c8.pdf
    • http://www.topcamfilmservices.com/uploads/1/3/0/6/130640033/bc4ceae73e3.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_off00006933.bin
9eb00cb7a0545e52498d4d0a54606f284a3684d352b499c3c842c7ac953df2cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6933 7428 bytes

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