Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc18d77c232b0b2b…

MALICIOUS

PDF

92.5 KB Created: 2021-03-02 23:24:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d2918ae1389c83dd7327409c67c0b985 SHA-1: 2d4beb2365939bae71aea6255db97d6dd8d338cb SHA-256: cc18d77c232b0b2bf811e3e53a007f46534512c2ec12b2ab2b7b0a16b275a834
206 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO abuse. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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://lozipotod.ru/123?utm_term=standard+form+701+instructions PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4478716/normal_5fff55cc88b4a.pdfIn PDF document text
    • https://nivujetomut.weebly.com/uploads/1/3/4/7/134753784/daxufe-tugawejanujat-gosogabalat-gokusizobidemu.pdfIn PDF document text
    • https://mumetimobenuja.weebly.com/uploads/1/3/2/3/132302956/vepesexotameb-pojuvediv-rukufase-niwululovibuwu.pdfIn PDF document text
    • https://cdn.sqhk.co/molavagew/i4Zjajc/mirutu.pdfIn PDF document text
    • https://cdn.sqhk.co/doginifa/VLdFhcM/real_driving_simulator_ovilex_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/zinoliwomi/ihhjghJ/all_my_discord_servers_are_gone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391605/normal_603594f3e557d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374968/normal_6036e3084b731.pdfIn PDF document text
    • https://cdn.sqhk.co/veludewozen/jj8heEW/green_bean_casserole_with_cheese_and_sour_cream.pdfIn PDF document text
    • https://cdn.sqhk.co/nuwobevina/qRjjjdD/disney_s_tiny_kingdom_nightmare_before_christmas.pdfIn PDF document text
    • https://kakabotosor.weebly.com/uploads/1/3/0/7/130775724/kifuxubal_mavaga.pdfIn PDF document text
    • https://jixivegeparimes.weebly.com/uploads/1/3/4/7/134749144/2700485.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nalifij/bevipegakiraxatat.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/kinetix_5500_stuck_in_configuring.pdfIn PDF document text
    • http://gezixus.myartsonline.com/46176942035.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/xemerasinexok.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/parchment_paper_cookie_sheet.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E2 5512 bytes
SHA-256: b47659cdf7508ea87adf9e47bd63a060494a529706c235e309667fdf29abe61e
font_01_sfnt_off00012799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12799 11608 bytes
SHA-256: ca5da6a108be9c2457c604223f85fef62317a954ac402cb73c09356327d9372d
font_02_sfnt_off00014f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F47 16140 bytes
SHA-256: 2732c78df68b4531e26da51a256f0f9ab881cb8a96d1886ade34872d88eeece3