Malicious PDF — malware analysis report

Static analysis result for SHA-256 c76f223d7a1f5f9a…

MALICIOUS

PDF

86.1 KB Created: 2021-03-29 14:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c5386cfcc4c7a0496cad22528d0b7bb8 SHA-1: d857620296b294b317ffd0c9b3120602ccf53978 SHA-256: c76f223d7a1f5f9a9d67f6abfe7ffa877f9fa4ea9694608f2a68d1602c31467b
126 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable hosting, suggests a link farm designed to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://golowaki.ru/wix?keyword=solving+similar+triangles+using+proportions+worksheet PDF link annotation
    • https://cdn.sqhk.co/letijefa/YPihUcH/romitovekenebiwijuwiviwos.pdfIn PDF document text
    • https://sumejuloluguwir.weebly.com/uploads/1/3/5/3/135390827/8673219.pdfIn PDF document text
    • http://papotupeti.iblogger.org/sivarazepigajemo.pdfIn PDF document text
    • http://risumeboze.getenjoyment.net/semof.pdfIn PDF document text
    • https://sisareses.weebly.com/uploads/1/3/1/4/131454440/tezane_fagutuwumumizep.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/effects_of_hyperinflation_in_zimbabwe.pdfIn PDF document text
    • http://giwitijudaleka.mygamesonline.org/94314540745.pdfIn PDF document text
    • https://jifefovemerozix.weebly.com/uploads/1/3/4/4/134444698/a71142864.pdfIn PDF document text
    • https://wekupadafar.weebly.com/uploads/1/3/5/3/135315244/2aad9453c.pdfIn PDF document text
    • https://lipopujowojirew.weebly.com/uploads/1/3/1/4/131408954/gowitagapopa_folime.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugewameru/ErOXFje/girl_ludo_king_game_download_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fobewejidopiwu.rf.gd/power_system_reliability_analysis.pdfIn PDF document text
    • http://jemekovivokuvup.epizy.com/bank_coaching_books_free_download.pdfIn PDF document text
    • http://sobawen.rf.gd/73245030873.pdfIn PDF document text
    • http://kaxoxosav.rf.gd/zirominodekigo.pdfIn PDF document text
    • http://ziwuxokivob.rf.gd/metodologia_de_la_investigacion_en_psicologia_clinica.pdfIn PDF document text
    • http://xefavab.rf.gd/prescribing_competency_framework_template.pdfIn PDF document text
    • http://xiletubijalu.rf.gd/88576585865.pdfIn PDF document text
    • http://renirujetumofid.epizy.com/kodevakowejim.pdfIn PDF document text
    • http://xifimerin.onlinewebshop.net/dyson_vacuum_cleaner_troubleshooting_guide.pdfIn PDF document text
    • http://fegugeg.rf.gd/nakuwuwe.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED53 5436 bytes
SHA-256: cbdc8d51b9d930df307845fb64747c11c7bdd32616af19756d962ba4b7593f65
font_01_sfnt_off0000ffaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAF 11252 bytes
SHA-256: c9b5e2787c2f94ddc2ad1cf397136289c39253ecec17fa77fdd77137e61c83b1
font_02_sfnt_off0001264c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264C 16404 bytes
SHA-256: 20f82f6f00fbcfdbf7f193beccbc18684a87ddd7e236d6a33917c7ce364f2727
font_03_sfnt_off00013c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C45 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176