Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99da07f177f991e…

MALICIOUS

PDF

31.7 KB Created: 2020-04-16 01:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 342262047d0ab9bac59d89723627e681 SHA-1: 9b31f985e849cd9375f2faadfb8b48b60aa7dc20 SHA-256: e99da07f177f991ec27e3534899c1676bb2455b50dd0a9b5e56bb66b383626c2
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links to other PDF files hosted on various domains, indicative of a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to a network of potentially malicious or deceptive content through these embedded links.

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://andmerchant.org/uploads/1/3/0/4/130490421/130490421.html#safety+in+carpentry+workshop+pdf
    • http://piperikuk.com/uploads/1/3/0/2/130288554/3540022.pdf
    • http://flip02blue.com/uploads/1/3/1/4/131437709/5964893.pdf
    • http://torahtruthministries.com/uploads/1/3/0/6/130621435/towunadinagozukese.pdf
    • http://lanardmcclindon.com/uploads/1/3/0/3/130379113/fff0d1c2a1ebdf4.pdf
    • http://glynnpt.com/uploads/1/3/0/8/130874340/1477be002.pdf
    • http://depthstudy5feudaljapan.com/uploads/1/3/0/3/130323930/fomogusoz-kopojixetanet-wipexezejifatek.pdf
    • http://winzelerinc.com/uploads/1/3/0/3/130379231/fosojikigurizofi.pdf
    • http://woodcuts.eu/uploads/1/3/0/6/130639504/3bb12fb12.pdf
    • http://joyftjourney.com/uploads/1/3/0/7/130775087/zijokixa.pdf
    • http://askaugustine.com/uploads/1/3/1/4/131437306/5123528.pdf
    • http://aqueoushumour.ca/uploads/1/3/1/3/131380078/papitiwo.pdf
    • http://dontworybehappy.net/uploads/1/3/0/6/130604162/mikaburotar.pdf
    • http://shore2delight.com/uploads/1/3/0/6/130639071/retisibazan.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_off0000584f.bin
b939be4b4c5d64eaca315deb2c43f15f945e87767a34d5ced382b9d6749729f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x584F 6680 bytes

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