Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8dcec9f6255034b…

MALICIOUS

PDF

76.8 KB Created: 2021-03-20 10:31:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 41c3f61c9bd5aa8cb93426da7f58b0a9 SHA-1: 89ed8bbf0dc05f3e085489627a44c34f5c186df1 SHA-256: f8dcec9f6255034be01c6201c313ccaa26a43e2cf494661fdbd530db74663ac6
206 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/wix?keyword=best+paid+iptv+service+2018+reddit PDF link annotation
    • https://rajopolaxobi.weebly.com/uploads/1/3/1/4/131406270/3195156.pdfIn PDF document text
    • https://fozujivopaj.weebly.com/uploads/1/3/5/3/135303700/889ef.pdfIn PDF document text
    • http://bagesopabiwub.scienceontheweb.net/fananetirasojonu.pdfIn PDF document text
    • https://diwosilanula.weebly.com/uploads/1/3/4/7/134765308/7fef9b8f2c0f66.pdfIn PDF document text
    • https://kefozonijufan.weebly.com/uploads/1/3/4/6/134689321/863066.pdfIn PDF document text
    • http://xivazokib.medianewsonline.com/40675103680.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402707/normal_5fe9cca097eb2.pdfIn PDF document text
    • http://fogarapisow.22web.org/chest_2012_anticoagulation_guidelines.pdfIn PDF document text
    • http://dakisemakegag.sportsontheweb.net/where_is_the_defrost_timer_located_on_a_hotpoint_refrigerator.pdfIn PDF document text
    • https://wapifonobuj.weebly.com/uploads/1/3/4/7/134744781/7807a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470207/normal_5fc6cf98e6139.pdfIn PDF document text
    • https://cdn.sqhk.co/xesozugis/z4giPjj/bowl_over_meaning.pdfIn PDF document text
    • http://wopexobow.mywebcommunity.org/ssc_stenographer_2020_question_paper_with_answer_key.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449193/normal_600930247a986.pdfIn PDF document text
    • https://suxosuliresud.weebly.com/uploads/1/3/5/3/135351283/e3520.pdfIn PDF document text
    • https://tavifarexup.weebly.com/uploads/1/3/4/6/134611028/jefosebugudi.pdfIn PDF document text
    • http://xomunuxeju.sportsontheweb.net/amiantit_oman.pdfIn PDF document text
    • https://cdn.sqhk.co/molodomo/vXAihja/top_down_shooting_games_ios.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pofomabagemekut.epizy.com/kjv_giant_print_reference_bible_genuine_leather.pdfIn PDF document text
    • http://xososalubebejen.rf.gd/abstract_format_for_mini_projects.pdfIn PDF document text
    • http://mojilobopage.rf.gd/toyota_avensis_2007_d4d_manual.pdfIn PDF document text
    • http://xikufozumif.epizy.com/argonautiche_libro_3.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_off0000e8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E0 5664 bytes
SHA-256: 9713db5f58fb9dc5922d4a20c7c7a80774a78ef30045504b450891f6587b40ca
font_01_sfnt_off0000fc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC44 11728 bytes
SHA-256: 4c47fc96686840c0cf8b4887bfa5f39a435d11eaaafc30cb4dbb7a0d1f0c6f7c