Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b2fe3b60533f9f…

MALICIOUS

PDF

32.3 KB Created: 2020-05-14 17:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3198c6951640682dbd1cb8a2aac29161 SHA-1: 936d2b22ecdc0d254584e3335d5f7cb8503e9c6b SHA-256: b9b2fe3b60533f9f6ee879035e5378764459a4a05207cad9463c71959547b4fa
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 to other PDF files hosted on various domains. This pattern is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly supports the malicious verdict. No scripts were extracted, but the extensive link farm suggests a primary goal of driving traffic to potentially compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://lisadmccall.com/uploads/1/3/1/3/131379538/131379538.html#inconsistent+and+dependent+systems+of+equations+worksheet
    • http://logpadin992.com/uploads/1/3/1/4/131406600/8114d15c49688d.pdf
    • http://deannepostma.com/uploads/1/3/0/8/130814416/fixixuwa-kufirezugaker-busolopepab-zuvom.pdf
    • http://tinastellen.com/uploads/1/3/0/6/130621337/944056.pdf
    • http://adodistribution.com/uploads/1/3/0/7/130775275/xesibozojal.pdf
    • http://laurivier.com/uploads/1/3/0/4/130483244/bokepiwaxiwupatuzuz.pdf
    • http://understandme.us/uploads/1/3/1/3/131380641/f00a8.pdf
    • http://kraigrobertlee.com/uploads/1/3/0/7/130740213/zoduzakezenabok_xeleriju_bodidiruka_jolasiv.pdf
    • http://repairmyrims.com/uploads/1/3/1/4/131438804/5adcf268a222b7.pdf
    • http://noiteediamusic.com/uploads/1/3/0/5/130589346/7765570.pdf
    • http://sentinelfirstaidtraining.com/uploads/1/3/0/4/130492963/fosiman_rarabejux.pdf
    • http://proficientorganizing.com/uploads/1/3/0/9/130969428/7fb4220a3c4f.pdf
    • http://medhoff.com/uploads/1/3/0/7/130739336/4414757.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_off0000542f.bin
49b2013d3e5136bfc7b33eb82a7e208747fbf62de3f0d1d04411d7ab82301902		 pdf-font-stream PDF embedded font (sfnt) at offset 0x542F 9744 bytes

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