Malicious PDF — malware analysis report

Static analysis result for SHA-256 69a58e74cdec96b8…

MALICIOUS

PDF

101.4 KB Created: 2021-02-19 09:47:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 0c89bcdcd61a375a21172a33ce9fec07 SHA-1: f6076d4e346c22e45a2bdecf232a3c131214a17d SHA-256: 69a58e74cdec96b8f61efd9cb8c6b5cd1581106a37984374bac409d6327677c6
244 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to disposable domains and redirector infrastructure, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=what+is+dialectical+relationship In PDF document text
    • http://dvestideyli.xyz/wujorik1ilkf.pdfIn PDF document text
    • https://cdn.sqhk.co/tukawezezo/ia3licu/reaper_pickaxe_fortnite_for_sale.pdfIn PDF document text
    • https://lilususuki.weebly.com/uploads/1/3/4/3/134317990/warixozoxaxaxemages.pdfIn PDF document text
    • http://abanca-electronica.com/the_challenge_war_of_the_worlds_2_finale_watch6kvoy.pdfIn PDF document text
    • http://manybigs.space/patricia_briggs_silence_fallen_epubgnsbn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472198/normal_6004819eb14b6.pdfIn PDF document text
    • https://cdn.sqhk.co/bebomopakax/4jjmJRM/easy_jobs_that_make_50k_a_year.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426262/normal_5ffe8bd2d5b8c.pdfIn PDF document text
    • https://cdn.sqhk.co/noxuluni/vfaDid0/71081060372.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/XSYDggP/quickbooks_shipping_manager_fedex.pdfIn PDF document text
    • https://lifexusubanipi.weebly.com/uploads/1/3/4/3/134377686/vujukika-wofapibebuwuxoz-satoziluniwapu.pdfIn PDF document text
    • https://cdn.sqhk.co/fafaviwi/ih7ghgd/35505995654.pdfIn PDF document text
    • http://raisinshq.club/why_wont_my_radiator_heater_turn_onr82o6.pdfIn PDF document text
    • https://nogiwesetegi.weebly.com/uploads/1/3/1/6/131637024/bizonibaraxomid-pafexinurasuwex-pugive.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zamonile.epizy.com/9230319182.pdfIn PDF document text
    • http://xagevudogitoti.epizy.com/saloji.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_off00014d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D31 5176 bytes
SHA-256: 62a5daed73c0ee9173113608cea373007fc991cd8fa7ec2156333157f9c832c7
font_01_sfnt_off00015ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ECF 13148 bytes
SHA-256: d3cf71188a18a0fa5d62164d4fbc99a7957f3da5941314b549befb6cd63a9795

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