Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5f49c8435f6f89…

MALICIOUS

PDF

74.0 KB Created: 2021-03-30 10:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1485eb468f81225a40039219c5505850 SHA-1: d3c176e33484726e537cebd2ab629b8e62bfcbda SHA-256: ff5f49c8435f6f890ff6ea5383711b195052a50a9d2ada16708faa1b9be1edd2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting and link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely as part of a phishing campaign.

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://dafemum.ru/123?utm_term=sql+injection+tutorial+pdf+free
    • https://cdn.sqhk.co/dasulujina/aQPoicw/sojujeligodofopu.pdf
    • https://cdn.sqhk.co/pujixefan/gcjhBjb/fuwogojufunibisufibetixuz.pdf
    • http://xiwikene.iblogger.org/baramati_midc_company_list.pdf
    • https://cdn-cms.f-static.net/uploads/4418575/normal_5fe90fe790836.pdf
    • http://fubawubu.22web.org/77869092038.pdf
    • https://cdn.sqhk.co/nasubivapu/fjjMhbz/hozier_movement_sheet_music.pdf
    • http://nuraramibifowom.22web.org/como_agua_para_chocolate_laura_esquivel_resumen.pdf
    • http://nokiwurugibub.mypressonline.com/beneficial_owner_form.pdf
    • http://leledup.mypressonline.com/21429967879.pdf
    • https://cdn-cms.f-static.net/uploads/4367305/normal_6050f5a156a54.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://buwopupewu.epizy.com/88391960428.pdf
    • http://vuxikujare.epizy.com/48796747588.pdf
    • https://uploads.strikinglycdn.com/files/01d574e1-ba05-475e-a0e7-2e46fdd8e544/map_of_earth_with_oceans_labeled.pdf
    • http://zivomunigewelo.rf.gd/xabepo.pdf
    • http://juwebud.epizy.com/lagu_surat_an_naba_1_40.pdf
    • http://babokad.epizy.com/wrestling_games_2018.pdf
    • https://uploads.strikinglycdn.com/files/b4b11ccb-2085-4864-9809-8cd3e4b84928/vocabulary_workshop_level_c_unit_7_completing_the_sentence_quizlet.pdf
    • http://kapirexazi.onlinewebshop.net/10693433852.pdf
    • http://xowepiguxuwo.epizy.com/jivaxazikajugaxilug.pdf
    • http://pezaruzij.rf.gd/80516630763.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_off0000e48e.bin
ea91c60ea0d75eb9d373628ac7a2630f94dc818a491ccf4b4b06c5eeefcba71f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE48E 5276 bytes
font_01_sfnt_off0000f697.bin
8284621d595a3c19c433257c27336adbf9ece6915159fea447e5b7611e53e594		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF697 10720 bytes

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