Malicious PDF — malware analysis report

Static analysis result for SHA-256 815870221af1d1a2…

MALICIOUS

PDF

35.7 KB Created: 2020-05-16 12:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af197c98e66bef5f61c01b3e6f70a5df SHA-1: cbf0bfa8549bdc3b4f0b7acc9f50605d36e5626b SHA-256: 815870221af1d1a25d5a850d14d54f8cc1c6f02a55ed6d5c0931c30d85d2d196
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of embedded external links to other PDF files hosted across numerous domains. The heuristic 'PDF_SEO_LINK_FARM' strongly suggests this is an attempt to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier further confirm its malicious nature, indicating it functions as a dropper. No scripts were extracted, but the sheer volume of external links points to a content distribution or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • ClamAV: Pdf.Dropper.Agent-9251790-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9251790-0
  • 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://hippiefreak.org/uploads/1/3/1/4/131452953/131452953.html#jodorowsky+way+of+tarot+pdf
    • http://phoneduke.com/uploads/1/3/0/9/130969682/30c67f6ef2065f9.pdf
    • http://aerofodder.net/uploads/1/3/0/4/130477839/9dda8cc47.pdf
    • http://findinggracellc.com/uploads/1/3/0/5/130590339/b15e0.pdf
    • http://anantaftv.com/uploads/1/3/0/4/130483062/wuwejijije-suvudupinavoben.pdf
    • http://elkvalleydesign.com/uploads/1/3/1/6/131636957/notenojeli.pdf
    • http://edenpermis.com/uploads/1/3/1/4/131408092/4021154.pdf
    • http://kite-klinik.eu/uploads/1/3/0/2/130270873/visoralaviv.pdf
    • http://cookiecrumbleslimes.com/uploads/1/3/0/7/130776724/xubusivusoluwukeweje.pdf
    • http://tikvah.one/uploads/1/3/0/7/130739015/3051475.pdf
    • http://ggmmonterd.com/uploads/1/3/1/6/131606233/joxorig-fezebu-kivijigo.pdf
    • http://newbohemiahomes.com/uploads/1/3/1/4/131407435/7941381.pdf
    • http://parkavenuevintage.net/uploads/1/3/0/3/130323465/buwikek.pdf
    • http://duncanwaldron.com/uploads/1/3/0/7/130739688/3f362b1164b9b.pdf
    • http://drive-lah.com/uploads/1/3/0/5/130589420/nabek_sater_risutu.pdf
    • http://drlauracano.com/uploads/1/3/0/4/130476098/7a5a0fe99f2897.pdf
    • http://spherecat.net/uploads/1/3/0/5/130588850/nezefuw.pdf
    • http://purplebuddies.com/uploads/1/3/0/6/130605216/jorujuxikole-rujepesul-fuzugu.pdf
    • http://healingcrystalmassage.com/uploads/1/3/1/3/131380292/ae7c5ece9124c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006061.bin
e08fae5279a02468b7ff408250cdd5e4ace6d011ee7ec6785fb9362c0c4be298
pdf-font-stream PDF embedded font (sfnt) at offset 0x6061 9776 bytes