Malicious PDF — malware analysis report

Static analysis result for SHA-256 3744fe9c74cdc933…

MALICIOUS

PDF

71.0 KB Created: 2021-03-04 10:45:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c6cc8ae2cf187aeacba8911c691df3bc SHA-1: 7feb0f9ee1eb844a75debd3e790915fd68e1cc77 SHA-256: 3744fe9c74cdc933a42da040085f2dfa165590a35e5a880a25f40608f1d174db
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, and one specifically uses a UTM term suggesting a lure for educational materials. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the idea that this PDF is part of a scheme to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://ponafet.ru/strik?utm_term=holt+algebra+1+textbook+pdf+answers PDF link annotation
    • https://cdn.sqhk.co/keropolor/Thd5wjb/top_best_usa_universities.pdfIn PDF document text
    • https://cdn.sqhk.co/ranetixeba/0QCOhhV/download_game_woodcraft_survival_island_mod_apk.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/zisomobafukale.pdfIn PDF document text
    • https://cdn.sqhk.co/jibetovo/TpQtjeH/piano_chords_songs_numbers.pdfIn PDF document text
    • http://pobadabodoz.scienceontheweb.net/are_mini_splits_better_than_central_air.pdfIn PDF document text
    • http://zumepaposakuf.scienceontheweb.net/tedotowarijalimedune.pdfIn PDF document text
    • http://tozofuji.scienceontheweb.net/lowrance_hds_7_gen_2_cover.pdfIn PDF document text
    • http://jinevul.mygamesonline.org/progress_in_mathematics_grade_3_teachers_edition.pdfIn PDF document text
    • http://sotipidikukunow.getenjoyment.net/kugetarujogazo.pdfIn PDF document text
    • http://lezeninimi.medianewsonline.com/fexiwero.pdfIn PDF document text
    • http://jewogipuwivi.medianewsonline.com/43686969468.pdfIn PDF document text
    • https://cdn.sqhk.co/tinupolureg/ib4uX3e/99382495458.pdfIn PDF document text
    • https://cdn.sqhk.co/gixotagokezu/wihgjjf/naxonugipemezo.pdfIn PDF document text
    • https://cdn.sqhk.co/tirabipati/gcgjEgh/samovom.pdfIn PDF document text
    • https://cdn.sqhk.co/padixemugex/F1gixZt/airport_x_ray_body_scanner_images.pdfIn PDF document text
    • https://cdn.sqhk.co/nizufalagef/fwhgrwl/zelepamalikojute.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ritumogadoj.onlinewebshop.net/how_to_use_prestige_induction_stove_pic_2.0_v2.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_off0000da04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA04 5584 bytes
SHA-256: 2b83ccaed0245662e5ee1664511a514430a024da7455a0d54537d0713c03f5ce
font_01_sfnt_off0000ed27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED27 9960 bytes
SHA-256: 7ee7a376415c8cb6de4ec70a3b9f087d2821e67bfd2c8e2a96a46b5bdaae2427

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