Malicious PDF — malware analysis report

Static analysis result for SHA-256 e78834ba2a246e0c…

MALICIOUS

PDF

52.8 KB Created: 2020-03-13 06:23:34 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0e3628c93936800d20a3526cc66554eb SHA-1: aaa9e1548f2d086702287f7c6c3a1c8fc27416e1 SHA-256: e78834ba2a246e0c5372c429c6e58002ff141e00c83e07dea803832cbe91228b
94 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, as detected by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though partially obfuscated, contains a URL that points to an HTML file, and the majority of the extracted URLs are PDFs hosted on various domains. This suggests a link farm or redirection scheme designed to lead users to potentially 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://vanyonline.com/uploads/1/3/0/5/130544091/130544091.html#%CE%B2-adrenergic+agonists+and+hypertrophy+of+skeletal+muscles
    • http://firstway.ca/uploads/1/3/0/7/130738638/ratuwudala_fifaromazu.pdf
    • http://jodyblackmore.com/uploads/1/3/0/6/130639885/71dbe2158d0d.pdf
    • http://www.consolidatedafricaservices.com/uploads/1/3/0/5/130543787/jugufoz.pdf
    • http://mx.passoverleague.org/uploads/1/3/0/6/130640126/1653262.pdf
    • http://chantillyescaperoom.com/uploads/1/3/0/7/130775053/5fce92a6dcb.pdf
    • http://penninsulatech.com/uploads/1/3/0/3/130313127/xagasilamuvavoxu.pdf
    • http://davidlgreenlee.com/uploads/1/3/0/4/130488513/4564397.pdf
    • http://sandeestudio.com/uploads/1/3/0/6/130621344/2839921.pdf
    • http://motomarriage.com/uploads/1/3/0/6/130620578/ad5e1d5bd.pdf
    • http://www.aroundthebay.us/uploads/1/3/0/7/130739082/1640093.pdf
    • http://shanghaishopper.com/uploads/1/3/0/4/130436450/6468451d976e.pdf
    • http://propheticvoicerelease.net/uploads/1/3/0/2/130289386/c2b18655794d5.pdf
    • http://msgrp.us/uploads/1/3/0/4/130483872/406733.pdf
    • http://lifemotivationmarketing.com/uploads/1/3/0/4/130435583/7757948.pdf
    • http://care-giving.com/uploads/1/3/0/5/130551692/dofobozasemaxik_zakuf_gajevapowufewul_wadubukeka.pdf
    • http://collectivekick.com/uploads/1/3/0/5/130543070/9860213.pdf
    • http://hylanheathcare.com/uploads/1/3/0/7/130739663/jenugezox_busabowopused_novepag.pdf
    • http://truexagency.com/uploads/1/3/0/6/130604725/eb8b3dc.pdf
    • http://djdanielmobile.com/uploads/1/3/0/6/130605283/wipifanerip.pdf
    • http://arlingtonlimoservice.org/uploads/1/3/0/8/130814349/sidapajapekupep_tamaxexogex.pdf
    • http://cosmichumanbeing.com/uploads/1/3/0/7/130739590/5bd895ba94.pdf
    • http://amyrasplicka.com/uploads/1/3/0/6/130604892/4572714.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009721.bin
e76deb7e2c73235e329b0935c70d358a6e70aea118d949764d873c8b74ee87c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9721 8484 bytes
font_01_sfnt_off0000b783.bin
ab626e3b4eed881f8a662ad3b28bf26cdcc4859dbdff19da7fc014c3bc0bbf5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB783 3024 bytes

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