Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ce9fc0bd9952a0…

MALICIOUS

PDF

74.6 KB Created: 2021-03-01 23:20:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a219a1780bc6a030b472aa973fdf2875 SHA-1: 44c5c194a964aa04709fe3ebac08d50349f850af SHA-256: c0ce9fc0bd9952a071ad2e51fcb364e928df16f1c44f1f6294822ccc9787daac
134 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this, indicating the PDF's purpose is to host many links on low-reputation domains. No scripts were extracted, but the presence of external URIs and the link farm heuristic point to a phishing or malware distribution attempt.

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/wix?keyword=invoker+guide+4e PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4376358/normal_6006efec699d5.pdfIn PDF document text
    • http://mujabelor.mywebcommunity.org/39854009528.pdfIn PDF document text
    • http://beviluxenumiliv.mywebcommunity.org/menawa.pdfIn PDF document text
    • http://gefosezidubajoz.scienceontheweb.net/sajekuvusakegazo.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/13163918420.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460266/normal_603a98f4b4118.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446784/normal_5fdc221f50087.pdfIn PDF document text
    • https://cdn.sqhk.co/musezikuzapi/hacojjf/crossroads_church_fitchburg_massachusetts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385216/normal_6016d54c09faa.pdfIn PDF document text
    • https://cdn.sqhk.co/nodujugebi/hdiiGzC/epic_games_fortnite_mobile_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/xiruregexibe/iabQjc9/bingo_games_to_play_at_home.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465255/normal_5fdecf80e5e7b.pdfIn PDF document text
    • https://cdn.sqhk.co/woxiwovar/dRibhfV/microsoft_sharepoint_online_backup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://naremijex.epizy.com/xodajirufuxolivoga.pdfIn PDF document text
    • http://befokube.rf.gd/xejevupipusixaloramitek.pdfIn PDF document text
    • http://xowilewegiwo.myartsonline.com/most_valuable_spiderman_comics_from_the_80s.pdfIn PDF document text
    • http://pesusakosu.rf.gd/intermatic_lamp_timer_instructions_model_tn300.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_off0000e93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93A 4724 bytes
SHA-256: 8b30057a267c7b94bfb1958141bc7d05b5ed073242a680004f1bccf1089064f2
font_01_sfnt_off0000f96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96D 10624 bytes
SHA-256: 941f3b67b35a1ee377bd0480a997e6aa629956e5ddc7ffe0b355ae92c92e9c7b

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