Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea25e4259e355728…

MALICIOUS

PDF

79.1 KB Created: 2021-04-18 10:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 7750ada4e60ac685dde47d27df8667ec SHA-1: c98ed456dad51552b62e47549574afedd8172780 SHA-256: ea25e4259e35572893576006ecf93e68369faf1e8e4a4157bda587fd4627d54d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links to various domains, many of which appear to be disposable hosting. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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/strik?utm_term=best+offense+vs+zone+defense PDF link annotation
    • http://otshelnik.net/lyman_reloading_data_30-06gzu3c.pdfIn PDF document text
    • https://soguleta.weebly.com/uploads/1/3/4/3/134305846/xipusede.pdfIn PDF document text
    • http://leporabev.mywebcommunity.org/dupoki.pdfIn PDF document text
    • https://pinababinazu.weebly.com/uploads/1/3/2/6/132695354/2631498.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/kased.pdfIn PDF document text
    • https://nopetozu.weebly.com/uploads/1/3/4/5/134507327/1543211.pdfIn PDF document text
    • http://miwewumexurigan.sportsontheweb.net/45890930086.pdfIn PDF document text
    • https://kewojuposadut.weebly.com/uploads/1/3/4/3/134374438/sirilifixabu.pdfIn PDF document text
    • http://gufutaca1.xyz/the_walking_dead_comic_book_wikipediaxo7l5.pdfIn PDF document text
    • http://oneitstore.pro/75533333377hppd1.pdfIn PDF document text
    • https://sakojokotinij.weebly.com/uploads/1/3/1/3/131379540/6862163.pdfIn PDF document text
    • http://neip-forum.fun/reading_comprehension_lesson_plans_2nd_gradexw7mr.pdfIn PDF document text
    • http://melowew.scienceontheweb.net/definicion_de_epistemologia.pdfIn PDF document text
    • http://itmax.info/dfsr_migration_guidexn18j.pdfIn PDF document text
    • https://ketumumev.weebly.com/uploads/1/3/5/3/135348104/kukaxipege_rexotogi_tumogesil_xefeb.pdfIn PDF document text
    • https://benipotuwazel.weebly.com/uploads/1/3/4/4/134445242/e8f1752.pdfIn PDF document text
    • http://testrun.ru/koxamumisisibexiwowikm70r3.pdfIn PDF document text
    • http://marafonsport.site/lowrance_hook_5_hdi_ice_transducer8s42d.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://tikukolaxu.rf.gd/manegofowigegaxelid.pdfIn PDF document text
    • http://kosogomozu.epizy.com/carsguide_car_of_the_year_2018.pdfIn PDF document text
    • http://kavuduvolilazod.myartsonline.com/mcgraw_hill_ebook_return_policy.pdfIn PDF document text
    • http://kagiweluxipo.epizy.com/jafinotitatizuramixem.pdfIn PDF document text
    • http://nopetavu.rf.gd/company_names_list.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC5 4464 bytes
SHA-256: 157a697d91e3e0322bcba9ba1404c87db7a53338cf18433c0c1c4a0f8b08930f
font_01_sfnt_off0000fa0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0E 10920 bytes
SHA-256: 8420c7c137f234d2bad50d5d796e1de219ea9383a88723147b668ec0fc989d62
font_02_sfnt_off00011f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4D 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f