Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c4592008640f7b2…

MALICIOUS

PDF

63.3 KB Created: 2021-02-19 08:52:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 7659ddc3eb393c46286205c8a3430876 SHA-1: a07b7981d23820f385e7249aacb0bd6140afcceb SHA-256: 2c4592008640f7b22539b6fe9e2011b4073f4384566b68effb6c1644f15c992b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the presence of external URIs and the overall structure point towards a phishing lure, likely using a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=bostitch+sb-1850bn+depth+adjustment PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489853/normal_5fd7915da87bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375358/normal_6018879597a6e.pdfIn PDF document text
    • http://martans.space/49075175478jnuqh.pdfIn PDF document text
    • https://rebomavarel.weebly.com/uploads/1/3/4/8/134883959/vaxewobinage.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454681/normal_5ffbc64453cfb.pdfIn PDF document text
    • https://duzobiwaroliwu.weebly.com/uploads/1/3/2/6/132696147/3a79844fb83c26.pdfIn PDF document text
    • https://nezasitize.weebly.com/uploads/1/3/5/3/135303973/b3b6cf90d.pdfIn PDF document text
    • https://vugogirofezufus.weebly.com/uploads/1/3/4/3/134355312/xefavaj_tituwifozu_putezos.pdfIn PDF document text
    • http://select-get.top/25793752362x3nr7.pdfIn PDF document text
    • http://pudirexuzil.iblogger.org/mubojozirosoname.pdfIn PDF document text
    • http://sandwichhq.club/what_is_remington_700_adl_bdl_cdl5ht98.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zirexig.epizy.com/dufufejezadegofov.pdfIn PDF document text
    • http://gujusama.rf.gd/album_answer_bts_mercado_libre.pdfIn PDF document text
    • http://modunatotuw.epizy.com/conjunctive_adverb_quiz.pdfIn PDF document text
    • http://vegiroromofi.rf.gd/eclipse_oxygen_4._7_3a.pdfIn PDF document text
    • http://wuriwafu.epizy.com/74569517517.pdfIn PDF document text
    • http://latilofu.rf.gd/wow_classic_macro_guide_warlock.pdfIn PDF document text
    • http://muxolisakij.epizy.com/duguzedulelinafevefid.pdfIn PDF document text
    • http://togipumenotu.epizy.com/arcade_game_emulator.pdfIn PDF document text
    • http://vizawog.epizy.com/bhai_marathi_movie_ringtone.pdfIn PDF document text
    • http://xikisefux.epizy.com/70717199440.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C8 5996 bytes
SHA-256: 144fe1fce78b14aedddfff46a725287697deef0f6fd1150cf19d0fb259c8bebc
font_01_sfnt_off0000cd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1D 10236 bytes
SHA-256: b97822d066181605f42008e83754b33154f15fa78225c5f1c8f890cc012e9eb0

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