Malicious PDF — malware analysis report

Static analysis result for SHA-256 785c8e4a1ce6ae98…

MALICIOUS

PDF

61.2 KB Created: 2020-04-02 03:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bec9f04bb84f7ef8b9074446fc7d0393 SHA-1: b777fc786010ca99b8c77ffb0eafcecefeb4ad31 SHA-256: 785c8e4a1ce6ae98b25bce06b338464f5275a06eb1e71ba7c00be1d74c62eb37
136 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, embedding numerous URLs that point to other PDF files. This technique is often used for SEO manipulation or to host secondary malicious payloads. The ML classifier strongly indicated maliciousness, and the presence of many external links suggests a coordinated effort to distribute harmful content or influence search results.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://open-roads.life/uploads/1/3/1/4/131454120/131454120.html#acoustic+guitar+tabs+for+country+boy+can+survive
    • http://hartfordplumbingandwaterheaterbusiness.com/uploads/1/3/0/4/130435581/tibodapasawaneganuzu.pdf
    • http://rushsoccertravel.com/uploads/1/3/0/4/130488736/045f1cc02426.pdf
    • http://mx.bonellipark.org/uploads/1/3/0/4/130436209/natoviwugojovofut.pdf
    • http://taxiclinix.com/uploads/1/3/0/7/130775746/dunuwekisibeniwamub.pdf
    • http://heeralandajay.com/uploads/1/3/0/5/130588721/pumobenu.pdf
    • http://wishesbrewtea.com/uploads/1/3/0/5/130588475/7a3e1a535.pdf
    • http://heartshareai360.org/uploads/1/3/0/2/130289792/zisaseduzojige_safejoj_vemekolek.pdf
    • http://textilowcost.com/uploads/1/3/0/6/130620840/vakawav-rijumusaraw-bixaru.pdf
    • http://amoscrabtreemagic.com/uploads/1/3/0/9/130969148/297325.pdf
    • http://beroean.org/uploads/1/3/0/6/130604102/ketasapali.pdf
    • http://anwenastley.com/uploads/1/3/0/2/130272582/233292f5.pdf
    • http://ptaust.com/uploads/1/3/0/2/130272432/ladet.pdf
    • http://lisatomczeszynart.studio/uploads/1/3/1/0/131069860/f4b25be8461.pdf
    • http://kittenfoxtech.com/uploads/1/3/0/8/130813923/nutozawowipusi.pdf
    • http://totalsuccesscoaching.com/uploads/1/3/0/4/130483653/8e9ab796bd6d5.pdf
    • http://divasmusicproduction.com/uploads/1/3/0/7/130739836/rafabe-vovuguloli.pdf
    • http://beach-music.com/uploads/1/3/0/7/130775062/tiximibegejusifosaza.pdf
    • http://denverofficebroker.com/uploads/1/3/1/3/131398447/tunopapijilofi.pdf
    • http://thepubcarolstream.com/uploads/1/3/1/1/131164321/sonamixixofim-vepox-xodavajapa-jefifaxo.pdf
    • http://intimatelyaustin.com/uploads/1/3/0/7/130775672/4971374.pdf
    • http://kaylaskitchen.org/uploads/1/3/0/6/130604768/b84e12e0be4.pdf
    • http://messiniako-catering.com/uploads/1/3/0/8/130873863/1f5246c1846d7d.pdf
    • http://tlpropertypreservation.com/uploads/1/3/0/5/130590403/vatomeze_vikok.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_off0000c74c.bin
68d4f9432b6b8562f397a93e854bc397fc5f97476a3b75c32db224a00b45926e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC74C 8196 bytes

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