Malicious PDF — malware analysis report

Static analysis result for SHA-256 802d04699c5a1d05…

MALICIOUS

PDF

47.9 KB Created: 2020-04-17 08:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 30b086869542374f6a3e95e357f1e9f1 SHA-1: d61f52f683c9c4ef29b05081e4c69899bbae6e6a SHA-256: 802d04699c5a1d05c1268affcc88fcda406d24f88b0a22ffc346f41e9305ba44
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, a common technique for SEO poisoning or directing users to malicious sites. The ML classifier strongly flagged this PDF as malicious. The presence of numerous PDF_URI and PDF_SEO_LINK_FARM heuristic firings indicates a deliberate attempt to create a link farm, likely to host or redirect to malicious content.

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://yourchairmansclub.us/uploads/1/3/0/7/130776106/130776106.html#bacteria+plural+form
    • http://hppwc.org/uploads/1/3/0/8/130874283/192020.pdf
    • http://floorcsi.com/uploads/1/3/0/3/130323554/tuzagafaxateno-pokegaxidig-navipiwa.pdf
    • http://rockfordperks.com/uploads/1/3/1/0/131070420/vugoletuzax-buzadasevakuv-watifu.pdf
    • http://openwaitinglistservice.com/uploads/1/3/0/7/130775831/zubukokepabel.pdf
    • http://bakerairgroup.com/uploads/1/3/0/7/130775633/nobufotadisowo_maxivubotewar_vokawi.pdf
    • http://helpchangelives.net/uploads/1/3/0/5/130550666/250dddb5b.pdf
    • http://getstarted247.com/uploads/1/3/0/2/130274370/4536209.pdf
    • http://urbanmommyexpo.com/uploads/1/3/0/6/130604292/wibepu-wenijapote-bonazutixinoxu.pdf
    • http://sydneyy.xyz/uploads/1/3/0/8/130873961/famif-bugogolobopunij.pdf
    • http://matrixsupplyinternational.com/uploads/1/3/0/2/130289161/2497075.pdf
    • http://theofficialsawgrassshuttle.com/uploads/1/3/1/1/131164313/tikadujujizi.pdf
    • http://adogenixptyltd.net/uploads/1/3/1/6/131606132/mesolumu_lodetokenodav_nuxoseparipid.pdf
    • http://openwaiti
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ca4.bin
27f053a3a2b65c190a2863669efc6bf4f5e1c7cce836309a8af2cac1c695f75b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA4 8944 bytes
font_01_sfnt_off00008cfd.bin
8e4c204c791d7c36ba2f30902a71783d40a5a4662d0d70d7010da4d09f1e50c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CFD 4520 bytes
font_02_sfnt_off00009bf3.bin
0c06c043268efda67a76b039e2d0670f8cf0aaf5dccff76af34bfc78ac16e24e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BF3 16504 bytes

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