Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5492e41271c7662…

MALICIOUS

PDF

81.0 KB Created: 2021-03-06 16:50:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d557c2a36289983a214738f3dff1b288 SHA-1: a2a5ede58cd0b6cc182240334395229eb650bf2f SHA-256: f5492e41271c76629fd07fba466169d972ba8138c3e8ef3b8e14919dbf2bb6c4
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an invoice-themed lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://jottigo.ru/123?utm_term=factors+of+production+worksheet PDF link annotation
    • https://zumusikibalagop.weebly.com/uploads/1/3/4/0/134096359/movijujusofe-kokigizemimofuv-sibiremubivaw.pdfIn PDF document text
    • https://guduzuzej.weebly.com/uploads/1/3/1/6/131606672/bebesedu-tikadi-givowu-fozegetemulugo.pdfIn PDF document text
    • https://jubekufolofifi.weebly.com/uploads/1/3/4/5/134593927/nenijow-nugigelexurug-pebadelanin.pdfIn PDF document text
    • https://najilemizosi.weebly.com/uploads/1/3/4/7/134730194/3387597.pdfIn PDF document text
    • https://nokojuponamipi.weebly.com/uploads/1/3/4/8/134891784/pufomej_kuxisoguzezom_bodoj_pagawatasigowo.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwoxebu/c2QdTdR/liwefema.pdfIn PDF document text
    • https://gatelixepa.weebly.com/uploads/1/3/1/1/131163507/xiwolonabezomal_femidalokotam_kimofawetiseka_zinafiwugoji.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/pusaxakowasotosijujupaxo.pdfIn PDF document text
    • https://pekonupag.weebly.com/uploads/1/3/2/7/132741447/relamarubujumizonuz.pdfIn PDF document text
    • https://cdn.sqhk.co/xovepejegosi/ajbMgff/final_freeway_2r_apk_pure_app.pdfIn PDF document text
    • https://vufuredupe.weebly.com/uploads/1/3/0/7/130776381/xesasabijefuzexu.pdfIn PDF document text
    • https://bivedaniliged.weebly.com/uploads/1/3/4/7/134732971/tuzadesufoveset_bijedaw.pdfIn PDF document text
    • http://jofipifemu.medianewsonline.com/p90x_workout_videos_free.pdfIn PDF document text
    • https://vepemetamat.weebly.com/uploads/1/3/4/3/134354227/gegofagufaseko.pdfIn PDF document text
    • http://fotubobuwenapu.scienceontheweb.net/83214740843.pdfIn PDF document text
    • https://kelurefuvaw.weebly.com/uploads/1/3/0/9/130969237/1054463.pdfIn PDF document text
    • https://penabapemuzoji.weebly.com/uploads/1/3/1/4/131453208/3764039.pdfIn PDF document text
    • https://jevezorubik.weebly.com/uploads/1/3/4/8/134864628/budepov.pdfIn PDF document text
    • https://cdn.sqhk.co/fiseguvugele/cDsVibx/mobile_service_coaching_centre_in_trichy.pdfIn PDF document text
    • https://cdn.sqhk.co/javomekoru/jhbgdYy/hidden_valley_road_family_tree.pdfIn PDF document text
    • https://woxogobigevi.weebly.com/uploads/1/3/0/8/130814596/2223954.pdfIn PDF document text
    • https://kefuluseze.weebly.com/uploads/1/3/1/3/131398598/dinozifovilefitom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ff80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF80 5324 bytes
SHA-256: 02749c4c85887a43c20d62eb19fd99d3b7465014f9e3c720379608b86e264953
font_01_sfnt_off000111ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AE 10912 bytes
SHA-256: 4fe009438b649b7cef00d9ae88baa9648691b5a1211b68b8df8da5fcee169314