Malicious PDF — malware analysis report

Static analysis result for SHA-256 e84c8b0b5bf2ca21…

MALICIOUS

PDF

78.3 KB Created: 2021-05-10 23:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d524c21b17f3de91b44059ab7c3db662 SHA-1: 21313a9605ebfeee8ad4351a70f3b806c49a8608 SHA-256: e84c8b0b5bf2ca217898d87c08932ebd2e9d38a7b3096ae8706a674ac4307c68
244 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains. Several of these URLs are identified as redirectors to known malicious infrastructure, and the ML classifier strongly flags this PDF as malicious. The presence of embedded URLs and the nature of the heuristics suggest a phishing or spam campaign designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=aw+tozer+quotes+on+fear In PDF document text
    • http://tuderoba.getenjoyment.net/zosotod.pdfIn PDF document text
    • http://tuvuvadirozo.iblogger.org/ab_initio_method_bioinformatics.pdfIn PDF document text
    • https://zolegezuboz.weebly.com/uploads/1/3/4/4/134462972/6911910.pdfIn PDF document text
    • https://valoxapemep.weebly.com/uploads/1/3/4/3/134305175/texagipobevazijufapu.pdfIn PDF document text
    • https://cdn.sqhk.co/sunalikefazo/XjjhvzC/webcomic_hosting_sites_2020.pdfIn PDF document text
    • https://laxigotugib.weebly.com/uploads/1/3/0/9/130969680/8479309.pdfIn PDF document text
    • https://femekeviwafuga.weebly.com/uploads/1/3/4/3/134345727/4073599.pdfIn PDF document text
    • https://gupebuxoguwev.weebly.com/uploads/1/3/4/3/134381402/zakaxofidutu.pdfIn PDF document text
    • http://mesutilixuta.sportsontheweb.net/english_speaking_course_notes_free_download.pdfIn PDF document text
    • https://nogisapu.weebly.com/uploads/1/3/1/4/131453993/7bd9b52d4fb75.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/he0sv0q/35063841176.pdfIn PDF document text
    • http://bizifemodefi.mygamesonline.org/zaxubezajuli.pdfIn PDF document text
    • https://cdn.sqhk.co/dolafita/ghcicvz/roku_ultra_remote_finder_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/tememukafosu/fgfjgSh/77988160600.pdfIn PDF document text
    • https://zudezujom.weebly.com/uploads/1/3/1/3/131384555/kusijediretu_fonugot_tekafarazek.pdfIn PDF document text
    • https://cdn.sqhk.co/xenudipu/c47YDJh/fuleboki.pdfIn PDF document text
    • https://cdn.sqhk.co/pujazojiwixi/rPFiehj/ripidukegomafiwugu.pdfIn PDF document text
    • http://motozed.scienceontheweb.net/29061501974.pdfIn PDF document text
    • https://tofapugorod.weebly.com/uploads/1/3/4/8/134885187/novenugegi_segilozamipuzo_gasaxapa_jijizorav.pdfIn PDF document text
    • https://gimituwemowi.weebly.com/uploads/1/3/4/8/134872285/naziwusarolunij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kinefinukabel.epizy.com/40897287406.pdfIn PDF document text
    • http://kefujaforu.rf.gd/champions_online_build_guide.pdfIn PDF document text
    • http://domebiwek.myartsonline.com/mebox.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_off0000f575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF575 4984 bytes
SHA-256: b3e415b16570bdf116da16951e4666756fd86197fc187bb8da6b368be108d509
font_01_sfnt_off0001069b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069B 10972 bytes
SHA-256: 38637848eaf7158be5647452aea9549563f420a64b1cc650d7a9363ec5dbe483