Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a3661e949edc32f…

MALICIOUS

PDF

35.1 KB Created: 2020-04-01 23:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c5a8fb2567583a4d4a6a18743a2d91c9 SHA-1: 19fe4849599b28f802e5ffbb2398421c2730df17 SHA-256: 7a3661e949edc32f26ce51deea99da7e412da566a4ce89cbac36eb8324ea0324
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links to various domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the sheer volume of external links points towards a malicious intent to redirect users or potentially host further malicious content.

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://helpking.org/uploads/1/3/0/8/130814457/130814457.html#new+braunfels+thrift+store
    • http://fredhessdvmllc.com/uploads/1/3/0/3/130312929/134009.pdf
    • http://stonefactor.net/uploads/1/3/0/6/130605447/6b37c8.pdf
    • http://kittitascarshow.com/uploads/1/3/0/4/130436204/4b1bd440b3967fe.pdf
    • http://voordenwij.nl/uploads/1/3/0/7/130739922/noviz.pdf
    • http://lucysblockblog.com/uploads/1/3/0/6/130639313/xedejakabexevij.pdf
    • http://gurtexltd.com/uploads/1/3/0/5/130589137/dowip-rimivute.pdf
    • http://planetelectricnj.com/uploads/1/3/1/0/131070618/6188912.pdf
    • http://e-darcytrie.com/uploads/1/3/0/6/130640116/xanifisigufabaj.pdf
    • http://redriverministries.org/uploads/1/3/0/9/130969738/zimitavoto-lubeviluxegeri.pdf
    • http://pipelinecourses.org/uploads/1/3/0/5/130551697/2436198.pdf
    • http://indiancreekinfo.com/uploads/1/3/1/1/131164238/576154.pdf
    • http://chapteronelc.com/uploads/1/3/0/9/130969195/304135.pdf
    • http://lindsayslashlifts.com/uploads/1/3/0/6/130621059/279405e0.pdf
    • http://artforacause.shop/uploads/1/3/0/6/130639678/3047525.pdf
    • http://pobopdx.org/uploads/1/3/0/9/130969419/ca3a88ab532c80.pdf
    • http://king-danielsfamilyreunion2019.com/uploads/1/3/0/8/130813143/xalivosupir.pdf
    • http://aspire-ai.com/uploads/1/3/0/7/130776078/juxumol-novipozofilijox.pdf
    • http://noiseboi.com/uploads/1/3/1/4/131407708/rijukurekowa-bufudawaxi.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_off0000608f.bin
e0c6cb1524d17875fbce34670fbeda5ba418fbca4869dd778d00b25aeff30d7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x608F 7860 bytes

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