Malicious PDF — malware analysis report

Static analysis result for SHA-256 185f50ad84b8d63d…

MALICIOUS

PDF

72.1 KB Created: 2021-03-18 06:28:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 935763647032e24420e4ea3fe4e01808 SHA-1: 7e1508561a5098c7c527cbc48d83514293ea91e4 SHA-256: 185f50ad84b8d63d826baaa49a6a04d50744282b46755d2f1512f0cd39551755
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains multiple embedded URLs, including one pointing to 'pelibifir.ru' which is associated with a link farm heuristic. The document body, though truncated, suggests a lure related to a '1998 jeep cherokee sport service manual'. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates attempts to direct users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 https://pelibifir.ru/strik?utm_term=1998+jeep+cherokee+sport+service+manual
    • https://cdn.sqhk.co/duloputemab/UgihpHY/tivisenunusel.pdf
    • https://cdn-cms.f-static.net/uploads/4496391/normal_5fd33e3e7e53a.pdf
    • https://cdn-cms.f-static.net/uploads/4457590/normal_601386d14be18.pdf
    • https://static.s123-cdn-static.com/uploads/4374517/normal_5fcb71ceb7343.pdf
    • https://static.s123-cdn-static.com/uploads/4447880/normal_5fce959ddf94b.pdf
    • http://moradudipomibo.mypressonline.com/40970831598.pdf
    • https://cdn.sqhk.co/nawakema/0Ibsggb/81177990041.pdf
    • http://lomuwugevona.getenjoyment.net/wojogavonakaxobakoxuzixu.pdf
    • http://xavelodezazil.iblogger.org/12301938149.pdf
    • https://cdn.sqhk.co/zejizoguzut/dOG8Ojh/guilty_pleasure_songs_of_the_90s.pdf
    • http://wanididezaj.getenjoyment.net/fedezakodo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/satuja/formation_of_aberrant_synapses.pdf
    • https://s3.amazonaws.com/lorugipopuxe/xonariduraxiniviji.pdf
    • http://likutolejit.onlinewebshop.net/54477663835.pdf
    • http://dimegebewode.epizy.com/sogogur.pdf
    • http://fusatepalu.epizy.com/vitiwovawepake.pdf
    • http://zekovulelopur.epizy.com/call_of_duty_ghosts_ps4_store.pdf
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_4e3b61754bd34aaaaef18ffca492f8ef.pdf?index=true
    • https://s3.amazonaws.com/folexapurilowe/beats_solo_3_best_price_canada.pdf
    • https://d19688e0-347f-4d9d-8cb3-d47c6e049f3d.filesusr.com/ugd/c618e9_a4f9202b4a9241939e06dbc1e34a6bd5.pdf?index=true
    • https://s3.amazonaws.com/xukonakefules/68083825741.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc31.bin
0fb23f6d436cb8af819e4c86f3a7d008130a27b1090e9019ef95924d2664b4e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC31 5680 bytes
font_01_sfnt_off0000ef66.bin
bdc0c3afbbd29d85d690ffc94231fc065500955bd9d411b1750cef543109154f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF66 10416 bytes

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