Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b08da5d4ce9bcf…

MALICIOUS

PDF

66.2 KB Created: 2021-02-27 16:53:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9429f677f7afc373cc3618b6443f461e SHA-1: d868c8e69fa0f0efcfaf27a3043fac990786b582 SHA-256: d8b08da5d4ce9bcf7332a6c9047101287daecf4d5ad33a797e28b7c942fcb051
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to other PDF documents hosted on disposable domains. The primary purpose appears to be SEO manipulation or distributing further malicious content, as suggested by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. No scripts were extracted, but the presence of many external links suggests a potential for further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/wb?keyword=what%20is%20the%20most%20accurate%20digital%20blood%20pressure%20monitor PDF link annotation
    • http://proita.space/vmware_compatibility_guide_for_vsphere_6._008ajs.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/jiigvhj/feximovabarotezeda.pdfIn PDF document text
    • http://topukovatawosu.sportsontheweb.net/xewoxakikanorojo.pdfIn PDF document text
    • https://cdn.sqhk.co/virurewev/Ohi1JXN/sodurogagowuwufara.pdfIn PDF document text
    • https://gajokazatiduker.weebly.com/uploads/1/3/4/3/134320060/9251708.pdfIn PDF document text
    • http://titanovyi-filtr.ru/2006_toyota_sienna_oil_filter_part_numbera5ht6.pdfIn PDF document text
    • https://cdn.sqhk.co/denidugabuni/ROgeYgi/last_day_zombie_survival_2_apk.pdfIn PDF document text
    • https://negowuvezesat.weebly.com/uploads/1/3/4/8/134859399/raxekof_lirabojakalezol.pdfIn PDF document text
    • http://onesmall.space/cricket_ranking_team_all_format1wc81.pdfIn PDF document text
    • https://cdn.sqhk.co/zukasedu/owggtPs/free_block_puzzle_app_for_iphone.pdfIn PDF document text
    • https://foxenaduro.weebly.com/uploads/1/3/1/1/131164157/fivubej.pdfIn PDF document text
    • http://mpvideo.org/how_to_clean_blu_ionic_air_purifierkjp6u.pdfIn PDF document text
    • https://cdn.sqhk.co/gidufulelav/bgfpczE/gravity_blanket_cooling.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/diablo_3_switch_2_player_one_console.pdfIn PDF document text
    • https://cdn.sqhk.co/bisidilit/tFjcgeI/bit_dungeon_2_free_apk.pdfIn PDF document text
    • https://wuwiragirek.weebly.com/uploads/1/3/0/8/130874366/1789056.pdfIn PDF document text
    • https://cdn.sqhk.co/pozigafo/i9igEFO/matchington_mansion_hack_apk_2020.pdfIn PDF document text
    • https://munefetuwavebif.weebly.com/uploads/1/3/2/6/132683017/d39a87b69d18b3b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gaxilitexu.onlinewebshop.net/line_6_pod_ux2_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/wordpress_front_page_template_file.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_off0000c8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EC 5640 bytes
SHA-256: 094205eeee806f2b12d7ad03001ed6976a54d6efffdaae1fad5fe545ade0617c
font_01_sfnt_off0000dbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF3 9108 bytes
SHA-256: 176bd6c6ab80d2056af0547e6696fa531b32b8da5cc3758db519e610ce93ddc6

Open this report in the interactive analyzer, or submit your own file for analysis.