Malicious PDF — malware analysis report

Static analysis result for SHA-256 230481b41a6b5945…

MALICIOUS

PDF

74.2 KB Created: 2021-04-22 22:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b4c1b71a91202ce2b408214a3ccd4cb5 SHA-1: 96c783a5f1cf49447b30f890e59bc5da6805d057 SHA-256: 230481b41a6b5945cfcd2d9ef326e06f32d70f41c326a3916c435a6bbb32d934
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm or SEO poisoning attempt. The primary URL, 'https://gimoguvi.ru/strik?utm_term=delonghi+oil+heater+not+working', suggests a lure related to search queries. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/strik?utm_term=delonghi+oil+heater+not+working PDF link annotation
    • http://rigoditibalun.mywebcommunity.org/download_film_percy_jackson_3_sub_indo.pdfIn PDF document text
    • http://nupewijanetari.medianewsonline.com/46667642964.pdfIn PDF document text
    • https://cdn.sqhk.co/ponajadu/lxijNWn/bubble_bobble_for_friends_ps4.pdfIn PDF document text
    • https://cdn.sqhk.co/norumuwapa/emRAKrj/play_minecraft_egg_wars_online.pdfIn PDF document text
    • http://xadixul.66ghz.com/89019152404.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/v0jhGje/52846795631.pdfIn PDF document text
    • http://nafewid.sportsontheweb.net/14607304982.pdfIn PDF document text
    • http://janorewaxeno.mygamesonline.org/74004553848.pdfIn PDF document text
    • http://busapibasin.mypressonline.com/mitul.pdfIn PDF document text
    • https://cdn.sqhk.co/vizinifum/bF0rhhA/99403759446.pdfIn PDF document text
    • http://befenonebo.iblogger.org/jotovolet.pdfIn PDF document text
    • http://pimebujeben.66ghz.com/api_527.pdfIn PDF document text
    • http://jixoxegige.iblogger.org/mapixudeb.pdfIn PDF document text
    • https://cdn.sqhk.co/siripeka/fif1giK/16173963822.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://valopuloti.rf.gd/realtek_hd_audio_manager_equalizer.pdfIn PDF document text
    • http://wugujub.onlinewebshop.net/imac_user_manual.pdfIn PDF document text
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_6ab940b6939143a7893a40e92f130d5f.pdf?index=trueIn PDF document text
    • http://vadupeti.epizy.com/jazugoxibubiwazupikiv.pdfIn PDF document text
    • http://dutataratoboruj.rf.gd/83723547526.pdfIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_6e3d50e5e1bb481faa92574cd9e95020.pdf?index=trueIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/difuzakamotizupasizolepu.pdfIn PDF document text
    • http://gozidonozali.myartsonline.com/85003140722.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_off0000e731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE731 4924 bytes
SHA-256: 876866994c9cef2032067b7583e70bf3712255dd6ad79246a591100dc857b08d
font_01_sfnt_off0000f800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF800 10432 bytes
SHA-256: 412e6014f7fb30caceb0cd7679b7c5c1a570d67982720328d5db808c26766c7a