Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdbf394a13900890…

MALICIOUS

PDF

50.0 KB Created: 2020-04-02 16:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: daf982cc0739a3769fad29adb259e22d SHA-1: b998667b2f0557edf069e13699eb1c12e81fdc32 SHA-256: bdbf394a1390089062261037961f67e0dabba403bd6513b8fe303ba3a4584c57
94 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with a significant number of external URLs embedded within it. The primary heuristic, PDF_SEO_LINK_FARM, indicates that the document contains a mass of external links, likely intended to manipulate search engine results or redirect users to potentially malicious content. No scripts were extracted from this sample, and the document body is heavily obfuscated, making it difficult to determine a more specific user-facing lure. The ML classifier strongly flagged this PDF as malicious.

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://mkequipements.ca/uploads/1/3/0/3/130324292/130324292.html#hieroglyphic+alphabet+chart
    • http://coworkercat.com/uploads/1/3/0/6/130604150/tosiwevasoru.pdf
    • http://mariocordoves.com/uploads/1/3/1/4/131406605/6834427.pdf
    • http://sojassyboutique.com/uploads/1/3/0/4/130488513/3109574.pdf
    • http://biomeculture.com/uploads/1/3/0/5/130550833/6475665.pdf
    • http://daniellafferty.com/uploads/1/3/0/6/130639277/fogomajixox.pdf
    • http://wwpgbc.org/uploads/1/3/0/5/130551864/f13971a.pdf
    • http://carolinastarrealty.com/uploads/1/3/0/5/130540795/a19f7e.pdf
    • http://whiteoakplantationbr.com/uploads/1/3/0/6/130639973/970fd685b0.pdf
    • http://windallion.com/uploads/1/3/0/5/130550723/vawejed-zogesel-xikuvitamo.pdf
    • http://linetendelivery.com/uploads/1/3/0/5/130540296/a1d586861bd50.pdf
    • http://sugar-studio-ct.com/uploads/1/3/0/8/130874583/d0417d65.pdf
    • http://kennebunkportbedandbreakfast.com/uploads/1/3/0/6/130639325/betigamoponezixenib.pdf
    • http://macchiatos.org/uploads/1/3/0/4/130483728/6938640.pdf
    • http://meadowlark-nm.com/uploads/1/3/1/1/131164383/lafawejudelav.pdf
    • http://humblebundleofjoy.com/uploads/1/3/1/1/131164185/sajejiwed.pdf
    • http://eastcoastloyalty.com/uploads/1/3/0/2/130272247/3999458.pdf
    • http://lumcraft.net/uploads/1/3/0/7/130739445/4237283.pdf
    • http://bzsmoke.com/uploads/1/3/0/6/130639690/tanarowavamenut-suzaditobe-papanavipud-fimewinevexab.pdf
    • http://macman-luckyrecords.com/uploads/1/3/0/7/130739002/vexeribewas.pdf
    • http://jaimeeann.com/uploads/1/3/0/5/130546036/5cac2bc515.pdf
    • http://rcboutiquellc.com/uploads/1/3/0/8/130874473/lapof.pdf
    • http://thepinktreasurebox.com/uploads/1/3/0/6/130621980/47e3903399.pdf
    • http://robkajiwara.org/uploads/1/3/0/5/130543976/gunalanidafota_xodikupi_wopijawe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b44.bin
442041e79215e1de35a60dc55a0cb62961cc593a7e28e617f253729b7cbf17b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B44 8204 bytes
font_01_sfnt_off00009aea.bin
1b3f82cd74c5b6671cc0c0d4a6c7877b74bb57ca469b2a61ef541918e41af838		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AEA 2652 bytes
font_02_sfnt_off0000a452.bin
4c749966e4e69a33e550f3d28fe335fb03cd3ebe2c883fc68e16fc2e93f080f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA452 16112 bytes

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