Malicious PDF — malware analysis report

Static analysis result for SHA-256 e57ebbdd07cfb5b4…

MALICIOUS

PDF

80.1 KB Created: 2021-03-18 06:33:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: bf6bc7862b0664287fcc87adf72b3c2a SHA-1: d58e0bea9d5827de2421da842240b96c9f0b2fa7 SHA-256: e57ebbdd07cfb5b43d0f8089e5fc1840e0e57129c8c9ae8cb1131b713193c8f4
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document body, though heavily obfuscated, contains references to 'Duraflame heater remote control instructions', likely a lure to encourage users to click the embedded external URI. The PDF also contains numerous links, many pointing to disposable hosting, suggesting a link farm used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/strik?utm_term=duraflame+heater+remote+control+instructions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472764/normal_602d4ce773b89.pdfIn PDF document text
    • http://lutikewoduwafev.iblogger.org/nibyo_by_charly_na_nina_video.pdfIn PDF document text
    • http://losopefopamusoz.sportsontheweb.net/linfoma_no_hodgkin_burkitt.pdfIn PDF document text
    • https://binigikuvoloxog.weebly.com/uploads/1/3/5/3/135332024/603940.pdfIn PDF document text
    • https://xunerekube.weebly.com/uploads/1/3/0/7/130739532/6924245.pdfIn PDF document text
    • https://kefuvavubuxega.weebly.com/uploads/1/3/1/1/131164002/xokubasab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414866/normal_602107db756dd.pdfIn PDF document text
    • https://fokomawirofuteb.weebly.com/uploads/1/3/0/9/130969657/jilusulijulok_panukijobedumi_zirenoxuvoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417990/normal_60038ed1a5760.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484990/normal_6014489e58860.pdfIn PDF document text
    • http://kedejivebirago.iblogger.org/bizirudutogozovivi.pdfIn PDF document text
    • https://tivubolo.weebly.com/uploads/1/3/1/8/131857038/9ebfae8ac62963.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca3ef9b5-f5a7-401b-b861-085eb026de1a/la_santa_biblia_catolica_latinoamericana_en_audio.pdfIn PDF document text
    • http://miwewugewu.atwebpages.com/linux_search_for_files.pdfIn PDF document text
    • http://jojomuge.epizy.com/xetizama.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/etq_8250_generator_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2751b890-fcf1-476a-a2a7-bd5c2fbdae07/67548359693.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/advance_health_care_directive_form_nj.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/63639217820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59b9405e-45f7-464c-85ec-87481e801a58/xumawewa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc444624-b29d-43d0-8910-f8a90d808bf8/53949700786.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/schlage_electronic_lock_battery_dead.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/vosowidopazobujonoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61ccc437-84c7-4f4e-b1ac-a2a5e958fb56/zikupabojiredovodowi.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_off0000fa99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA99 5120 bytes
SHA-256: 9854baf52435b7bb0f7f9b6b5d4724817ad4fb399b89635abe1ed17387ba0a68
font_01_sfnt_off00010be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE0 11480 bytes
SHA-256: 0053d67975b34a66c5b677a30ee63f4b07b3af1b626a229dce103ad32e76acae