Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e2881dd703ee558…

MALICIOUS

PDF

88.0 KB Created: 2021-04-06 07:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cac66db380cc4e179eafd0eacd3b271a SHA-1: b9c0cc3368248cb08b35f15dd9222de8af5cd4ec SHA-256: 2e2881dd703ee5588e69bc8866678ca95b80dd91bb94e898839d1a2fffd99000
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm on disposable hosting, with numerous URLs pointing to other PDFs, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains keywords related to repair manuals, likely serving as a lure.

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://jacksth.ru/strik?utm_term=philips+respironics+everflo+repair+manual PDF link annotation
    • http://idealslimitalia-official.site/naval_aircraft_maintenance_manualuplze.pdfIn PDF document text
    • http://sudilufib.getenjoyment.net/best_wireless_keyboard_mouse_combo_gaming.pdfIn PDF document text
    • http://nubilofanekib.mygamesonline.org/kalisogamuvupewenuk.pdfIn PDF document text
    • http://palopej.sportsontheweb.net/biozone_year_12_answers.pdfIn PDF document text
    • http://dexuposi.sportsontheweb.net/begeve.pdfIn PDF document text
    • http://idealslim-italiaofficial.site/chicco_keyfit_30_canada_expiry_date870na.pdfIn PDF document text
    • http://kepuxom.mypressonline.com/teacher_appreciation_letter_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370303/normal_605c143178365.pdfIn PDF document text
    • http://rte-ita.fun/selling_on_etsy_in_californiakcz9w.pdfIn PDF document text
    • http://remont-pc.website/25392003384u8bg7.pdfIn PDF document text
    • http://ketadiets.site/carers_allowance_form_onlinee9vz6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447641/normal_603d2e7e070cf.pdfIn PDF document text
    • http://ottics.ru/zapinozanedadivexux3d388.pdfIn PDF document text
    • http://xukosususif.medianewsonline.com/lord_i_m_amazed_by_you_chords.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://novogizeboje.myartsonline.com/wunenebufozatakuzuvula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e021ccb-13ba-4a72-a756-ae8596e3e87c/how_to_renew_food_stamps_online_ga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0019fb5c-e10e-4024-9c5e-adf262c173f8/how_do_i_apply_for_a_job_at_walgreens.pdfIn PDF document text
    • http://gegilifopom.myartsonline.com/19675607781.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_off00011a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1A 5316 bytes
SHA-256: 21729584c7256cdc39f99a1ff73bb551afeee84ffefa5df16a97fcd55e786709
font_01_sfnt_off00012c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0F 11380 bytes
SHA-256: 6f2ab5e91b7ca591c4acfc1237e7d0b78677fb91cee4404bf1e4a42de6734921

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