Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b80dc9536fdf30f…

MALICIOUS

PDF

38.0 KB Created: 2020-04-03 12:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2e81ac6295f85d1a943736d66f7952e8 SHA-1: 556efb3a3a23521d2691813af8bb49938dde1c34 SHA-256: 7b80dc9536fdf30f71c8daf9fc8a6b96a8e8bac57c764abf587a3da010be8e07
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF files hosted on various domains. This pattern is indicative of a link farm or SEO manipulation tactic, potentially used to distribute malware or engage in phishing. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of specific user-facing lures.

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://ankezimmermann.ca/uploads/1/3/1/4/131438419/131438419.html#esv+reformation+study+bible+large+print
    • http://laurensheil.com/uploads/1/3/0/6/130620930/lenadomadeja.pdf
    • http://danielle-snyder.com/uploads/1/3/0/4/130475881/c270d.pdf
    • http://gosyart.com/uploads/1/3/0/2/130271234/selegiwosufi-nuranav-mosifudi-fugiw.pdf
    • http://idahononprofitservices.com/uploads/1/3/0/4/130476557/6040304.pdf
    • http://yockerz.com/uploads/1/3/0/9/130968911/dolaxeb.pdf
    • http://ladyvoice.net/uploads/1/3/0/4/130476921/losakoxed.pdf
    • http://kahauling.com/uploads/1/3/0/8/130874207/7822952.pdf
    • http://partyrighthere.com/uploads/1/3/1/0/131071043/1037255.pdf
    • http://goldenspiralflinflon.com/uploads/1/3/1/3/131379026/bajesurulusud-ximezo-xirega-fuzexafixeti.pdf
    • http://thestorystudiohk.com/uploads/1/3/0/2/130289417/6327150.pdf
    • http://post.directory/uploads/1/3/0/7/130739081/d132d.pdf
    • http://caregivercoffee.com/uploads/1/3/0/6/130621788/8827024.pdf
    • http://regimentsupport.org/uploads/1/3/0/4/130492771/bofubogotidokuwexuf.pdf
    • http://rein-inc.com/uploads/1/3/0/6/130603931/faroravuvuxitelob.pdf
    • http://kiddomore.com/uploads/1/3/1/0/131070526/8aef26.pdf
    • http://thelavenderdish.com/uploads/1/3/1/4/131436978/8288786.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_off00006b21.bin
53969327c8867b42a573c28c7a0dc802d863fc74bb103c75c3192a863fe08be4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B21 8180 bytes

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