Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d8fd193a88d27ec…

MALICIOUS

PDF

121.4 KB Created: 2021-02-19 04:03:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 73878a24287142d66afe1d464ddcc761 SHA-1: 7c2db7a13924a658a56cd76b4443b49dda2e4b28 SHA-256: 8d8fd193a88d27ec577ef0aea6e2f3ed970cf46ffb5006904a47be12259ca41f
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of embedded links, many of which point to disposable hosting or redirector infrastructure, indicating a link farm designed to distribute malicious content or phish users. The primary malicious URL identified is https://yafferge.ru/wix?keyword=9.1+independent+practice+answer+key+7th+grade, which is likely used to serve a second-stage payload or redirect to a phishing site. No scripts were extracted, but the PDF structure and link farm characteristics strongly suggest a malicious intent.

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
  • 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://yafferge.ru/wix?keyword=9.1+independent+practice+answer+key+7th+grade In PDF document text
    • https://s3.amazonaws.com/bulujono/misipenokod.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/wolunaginewuxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471240/normal_602eb5f66188b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479904/normal_5ffc751c3a713.pdfIn PDF document text
    • https://totovipuvo.weebly.com/uploads/1/3/2/7/132740708/9938279.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/phgiagg/cool_games_to_play_on_computer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369932/normal_6004f54b5f7c8.pdfIn PDF document text
    • https://nuguviroguzemek.weebly.com/uploads/1/3/1/0/131070089/5458412.pdfIn PDF document text
    • https://cdn.sqhk.co/jusitufugaf/giyoPgf/suzefekolazag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486199/normal_5fe20186877a8.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/coplanar_waveguide_with_ground.pdfIn PDF document text
    • https://cdn.sqhk.co/kajutizikodu/xKhdjgC/download_real_steel_boxing_champions_mod_apk_data.pdfIn PDF document text
    • https://cdn.sqhk.co/pefevepufi/Gihjbhg/optical_illusion_rug_bridge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410206/normal_602dca2cac7df.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/27507056586.pdfIn PDF document text
    • https://nusuwexob.weebly.com/uploads/1/3/4/3/134352417/15b87f117cdd2f.pdfIn PDF document text
    • http://in-step.shop/vokixonegudevvo2eb.pdfIn PDF document text
    • https://cdn.sqhk.co/dutudovajud/eibNid3/sims_4_cheats_xbox_one_get_famous.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001769f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1769F 5464 bytes
SHA-256: af6bfdeb9cb15ba67c2ab72f8e5f8aef9fed187cad12937d2f85cfeb1d779a2d
font_01_sfnt_off00018949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18949 13244 bytes
SHA-256: faaa8be895d6472bf2916b07e063730b0422f1a4d2cba8fda451a145f4049a6a
font_02_sfnt_off0001b496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B496 16072 bytes
SHA-256: f3b752e25d2e3098dc5b351a512c5ca672d2b137fcb7ddb3f81b2384be51d5c3
font_03_sfnt_off0001c934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C934 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3