Malicious PDF — malware analysis report

Static analysis result for SHA-256 73def8a4e24012bf…

MALICIOUS

PDF

87.9 KB Created: 2021-03-10 12:45:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0144a207b2b9cbd5af864ed6ab643f9f SHA-1: f0f094af657229e1837481eb1a1123e4328b5c26 SHA-256: 73def8a4e24012bffa49871fd34b3d342f16926c84e5d3525e01df635b8eb7c4
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs that are part of a link farm, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and the ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to a textbook search, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/award?keyword=ap+biology+textbook+campbell+11th+edition+pdf+free PDF link annotation
    • https://kanumipiga.weebly.com/uploads/1/3/5/3/135346224/pinuniw.pdfIn PDF document text
    • http://vedibekupuviru.iblogger.org/fegolaxamutexapojijilik.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/95429532674.pdfIn PDF document text
    • http://lnstagram-office.com/dbt_worksheets_for_emotional_regulationzmkup.pdfIn PDF document text
    • https://lefelovavuj.weebly.com/uploads/1/3/4/6/134644752/7307138.pdfIn PDF document text
    • https://kuxadolawemigos.weebly.com/uploads/1/3/4/7/134712866/cdc5b.pdfIn PDF document text
    • http://deine-gabe.com/53109148955j894x.pdfIn PDF document text
    • http://dontbeshy.xyz/batman_arkham_knight_able_content_freev5tnl.pdfIn PDF document text
    • http://visezuxopusifik.iblogger.org/apk_file_minimizer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c942585d-1bed-4479-adff-05857d5db5d7/life_skills_training_program_effectiveness.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06c41f46-56d2-46a5-9a57-13f4afd735a4/how_much_weight_can_a_plastic_bag_hold_experiment.pdfIn PDF document text
    • http://xoxasosopu.epizy.com/rutetekelotulara.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b2a8047-1843-490b-ad41-e81587e75f38/24894296525.pdfIn PDF document text
    • http://mulozeraxepe.epizy.com/microplate_reader_biotek_manual.pdfIn PDF document text
    • http://rarifefivafew.epizy.com/start_settings_activity_android.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/simofovelagulufetuke.pdfIn PDF document text
    • http://sokozujetabil.rf.gd/69346711019.pdfIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/nokia_android_phones_under_8000.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/real_vs_bayern_match_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/269930df-6eed-4b9c-88d1-32286e6c2f31/panasonic_plasma_tv_wont_turn_on_blinking_red_light.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/wozexifiwetoxukafum.pdfIn PDF document text
    • http://lufafutogixafu.rf.gd/chromium_for_pc_windows_7.pdfIn PDF document text
    • http://widuxetikos.epizy.com/button_animation_in_android_studio_github.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29ab7147-ddea-4904-b7eb-ba0531835137/what_ink_does_epson_wf_3640_use.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_off000118dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DD 5804 bytes
SHA-256: b076340bfcb38abdbd4efb924bbcbaa4efbd0eb37fe25b45d33f72aa6586e7ce
font_01_sfnt_off00012c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C90 10464 bytes
SHA-256: 4348c53a923bb9a32d0af783bee3aa8a9bde0eb1f216a3f8c3baccdd749edac8

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