Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13d92cc206afd5d…

MALICIOUS

PDF

72.7 KB Created: 2021-03-28 04:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: da7a6d3352a1444cd3d33f432cd3321f SHA-1: 6bed3698293250ca53be55d494833da4d7c842db SHA-256: a13d92cc206afd5dfe3b8b26f3ccba7009ed23010a2fab3285d4de9ff120fabe
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF sample was flagged by ML classifiers and ClamAV as malicious, indicating it's likely a phishing or trojan delivery mechanism. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm or redirection strategy to host malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

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.
  • 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://dugedepap.ru/award?keyword=past+perfect+tense+worksheet+for+grade+7+pdf PDF link annotation
    • http://dmgameplan.com/95864479333uhk6v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417422/normal_602b43147243b.pdfIn PDF document text
    • https://palejuzuz.weebly.com/uploads/1/3/5/9/135959315/8039784.pdfIn PDF document text
    • http://pay-order.info/bizhub_c224e_firmwarew3fl7.pdfIn PDF document text
    • http://nitanupemil.mygamesonline.org/inc_syllabus_for_bsc_nursing_1st_year_2020.pdfIn PDF document text
    • https://logifuvixejexa.weebly.com/uploads/1/3/6/0/136019385/dutuvediv-mesenawineme-darusazowes-tarok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446174/normal_5feb34916cbcc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384150/normal_60028b10ca4b9.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/30005687225.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417312/normal_604e5bbb03b0f.pdfIn PDF document text
    • http://agencymedia-ig.com/how_to_use_waterpik_ultra_flosser8r4v9.pdfIn PDF document text
    • https://feloxoxux.weebly.com/uploads/1/3/4/0/134000485/2dc6b1864.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470985/normal_5fcb56483b1da.pdfIn PDF document text
    • http://loneresel.mygamesonline.org/75024782566.pdfIn PDF document text
    • http://samemere.mygamesonline.org/neet_biology_chapter_wise_questions_and_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://demezokesude.rf.gd/fevum.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/julius_caesar_summary_act_1_scene_2.pdfIn PDF document text
    • http://puzuniposodaf.epizy.com/2003_saturn_l200_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/7439056015.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_off0000dcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDE 5624 bytes
SHA-256: bbec09d1c5b4423cc14c61822cafe272a569895d07e5963014295bbd4d3ba2b6
font_01_sfnt_off0000f017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF017 10384 bytes
SHA-256: 3676e3fe66f74bfb4f109539db96b6015ed74c82822b826bf6429c2e22623888

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