Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61ffba1862a1126…

MALICIOUS

PDF

42.4 KB Created: 2020-04-22 16:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cb5d45417441bfdfae5276767657786b SHA-1: bc377d3adcb0a17376543e7542723e342cfcdbff SHA-256: b61ffba1862a11262b720f7dba69132db28b08ed116b5cfe875ecd595ce885e3
94 Risk Score

Malware Insights

MITRE ATT&CK
T1598 Gather Victim Identity Information T1204 User Execution

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files on different domains. This suggests the document is part of a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier also strongly indicated maliciousness.

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://jaicorp.net/uploads/1/3/0/2/130289371/130289371.html#python+f+string+format+width
    • http://rocketdispatching.com/uploads/1/3/1/6/131606059/gewusemadobopu.pdf
    • http://corovoci.com/uploads/1/3/0/8/130813866/losimopone_tegiz_vumenet.pdf
    • http://customuv.com/uploads/1/3/0/5/130540477/jinep.pdf
    • http://academyonhigh.com/uploads/1/3/0/6/130604417/0bf6f74dc.pdf
    • http://cadeaudlove.com/uploads/1/3/0/5/130590663/viwiwabima.pdf
    • http://summersaleswork.com/uploads/1/3/0/2/130289415/vujar-zujotiluvem.pdf
    • http://kiddieclassiqueghana.com/uploads/1/3/0/6/130603702/4602413.pdf
    • http://besticecream.org/uploads/1/3/0/4/130476043/sejelonu_figapovakirenib_mirerikuvup.pdf
    • http://fcminisoccerstars.com/uploads/1/3/0/3/130313480/7727902.pdf
    • http://swisshashtag.ch/uploads/1/3/0/5/130590356/finusafasutofe.pdf
    • http://chackalayil.com/uploads/1/3/0/8/130814007/cb7ca5.pdf
    • http://kiddieclassiqueghana.com/uploads/1
    • 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_off000078b7.bin
f1c87c79344cc8cb3cc0f0229256c7b72c6204131eb89a74e2e9dc5b394eb2ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78B7 9400 bytes

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