Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f7a0b27d7c90cd…

MALICIOUS

PDF

69.6 KB Created: 2021-03-24 14:16:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0c56d38eb67998bd7e07a81371aadd51 SHA-1: ea89c6a585df3e6213f961a2f729cfae96c5596d SHA-256: c8f7a0b27d7c90cd8d97a845d5bfe684eae13009b010e6b91bb60b262605c620
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious phishing content. Heuristics indicate it functions as a link farm and a callback phishing lure, directing users to potentially malicious websites. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to phishing sites or initiate fraudulent phone calls.

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://gimoguvi.ru/wix?keyword=hudson+community+television+hudson+ohio PDF link annotation
    • http://sberbank.services/tatufenotojugotusriab.pdfIn PDF document text
    • https://cdn.sqhk.co/lixetajetevu/ziexrig/kizonaredo.pdfIn PDF document text
    • http://callipakk2.site/xifurefemupe63zu.pdfIn PDF document text
    • http://tupabuwojoji.iblogger.org/79481502237.pdfIn PDF document text
    • https://cdn.sqhk.co/bafesugoguwi/hfSigSt/71829989937.pdfIn PDF document text
    • http://dotavulilego.mypressonline.com/38831420234.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/U95Vgeb/all_creatures_big_and_small_lacona_ny_address.pdfIn PDF document text
    • http://tosety.xyz/sweet_recipes_with_heavy_creamdjfs9.pdfIn PDF document text
    • https://cdn.sqhk.co/bufomofa/FXgcibp/call_of_craft_blocky_tanks_battlefield_1.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://wepirizifomonij.epizy.com/castlevania_rondo_of_blood_psp_iso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1caecdd7-ff3c-43bb-a86c-278772093ca4/how_to_program_remote_to_cable_box_suddenlink.pdfIn PDF document text
    • http://ligekasuxube.onlinewebshop.net/87879954472.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/pezesipubive.pdfIn PDF document text
    • http://jijetebum.epizy.com/enrichment_worksheets_for_1st_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dbc23a7-ccaf-4093-8087-63f84c125fe5/starcraft_aluminum_boat_for_sale_ontario.pdfIn PDF document text
    • http://zaduzos.myartsonline.com/desh_pujabarshiki_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/zigutebigibu.pdfIn PDF document text
    • http://meridupomosim.epizy.com/elevation_worship_do_it_again_sheet_music.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F4 4876 bytes
SHA-256: a106a44199eb93b7fb79f0aa95993a4cdfd19a77c93786e0bd47e66259128940
font_01_sfnt_off0000d961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD961 10120 bytes
SHA-256: 5fc1f32be54d0b6f9c9d05c3887df386fdb8755ccefc732b2fc7a11b26d15e2a
font_02_sfnt_off0000fb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3D 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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