Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8098c2aa82cc5ba…

MALICIOUS

PDF

46.4 KB Created: 2020-04-12 01:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0b40ea8b573ffd6e79123c652cfafc8a SHA-1: 67167bd9461e28717bd8c7bfbe9e07cb29d88522 SHA-256: b8098c2aa82cc5ba37725feb83d9e4b6bd2a3da62d36702f78afcf7c793390f3
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, many of which are numerically or generically named, characteristic of a link farm designed to manipulate search engine results or distribute malware. The document body, though partially corrupted, contains text related to administrative processes and includes a URL that appears to be part of this link farm. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious link distribution scheme.

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://lightincgame.com/uploads/1/3/0/8/130814596/130814596.html#analisis+del+proceso+administrativo+de+un+restaurante
    • http://clonmelbuilding.com/uploads/1/3/0/7/130775528/6938823.pdf
    • http://allstarservicegroup.com/uploads/1/3/0/5/130588162/4634600.pdf
    • http://myburnsfamily.com/uploads/1/3/0/6/130603814/laruxuxujakir_doxevuda.pdf
    • http://abmdevelopments.org/uploads/1/3/0/5/130588893/3e616bab51a4.pdf
    • http://miroirdesalon.dk/uploads/1/3/1/4/131437725/1033486.pdf
    • http://fotofauv.com/uploads/1/3/0/6/130621940/dagitipebiriribujof.pdf
    • http://goodmorningkampot.com/uploads/1/3/1/1/131164564/0df6ce6.pdf
    • http://dobermannshow.com/uploads/1/3/0/6/130604744/6015884.pdf
    • http://derrickcrudupsr.com/uploads/1/3/1/4/131407565/c14297c7ee2a.pdf
    • http://dronehubonline.com/uploads/1/3/1/3/131382141/1399222.pdf
    • http://daradee.com/uploads/1/3/1/1/131164109/vilikepa.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_off00008af3.bin
7b8e06b9c5feb46dca3d71867150610c9909917e58ccee710b6d98c7123ea3ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AF3 8952 bytes

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