Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5fd1d355ea69ed2…

MALICIOUS

PDF

61.6 KB Created: 2021-02-20 20:57:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5e20db9f402e5bbd132cb2e354684759 SHA-1: 8133cade762a8d4b910a3fd2979ebfac999846e8 SHA-256: f5fd1d355ea69ed2d9bb2962d9bd05dff347e91447743b4a4f322e2fd6b3a474
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=live+life+lives+difference PDF link annotation
    • https://cdn.sqhk.co/jirudumom/8Bjha5s/time_jump_for_the_king.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473056/normal_5fe25cfeb34e4.pdfIn PDF document text
    • https://cdn.sqhk.co/boxumiza/0ylPJhj/real_cricket_20_android_requirements.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391611/normal_5fed4fcd810b4.pdfIn PDF document text
    • https://xoritiluvugabem.weebly.com/uploads/1/3/2/6/132695829/8334809.pdfIn PDF document text
    • https://damesijegimu.weebly.com/uploads/1/3/4/6/134624484/1984544.pdfIn PDF document text
    • https://xunasumip.weebly.com/uploads/1/3/2/6/132696393/598577.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478137/normal_602e6768251a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474218/normal_6027056ceb16f.pdfIn PDF document text
    • https://titumakusijuvap.weebly.com/uploads/1/3/4/3/134353199/fovoji-vorozipoki-kadopiluvaze-pepelikofirir.pdfIn PDF document text
    • https://cdn.sqhk.co/zikufivol/7tX7Yje/dark_legends_pack_fortnite_buy.pdfIn PDF document text
    • https://cdn.sqhk.co/wijelukifap/gj4hhtl/nfl_weekend_game_results.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/hbgfaQB/dream_league_soccer_club_america.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479675/normal_5fdb277fd1748.pdfIn PDF document text
    • https://luwanolukurodo.weebly.com/uploads/1/3/5/3/135397368/zivoxejegotupatu.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_off0000b815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB815 4804 bytes
SHA-256: d1b135dff3e13019f00fb8f95bddbaea8ef11d5699b8dfa73a080c10f204c2cc
font_01_sfnt_off0000c887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC887 9756 bytes
SHA-256: 23065620e16dc727b775e9ceb617e05880ae5d43b102ebd40e48abad198bf7b6

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