Malicious PDF — malware analysis report

Static analysis result for SHA-256 26bf56a727eddcbe…

MALICIOUS

PDF

87.2 KB Created: 2021-06-02 07:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: a2206264c5196d35d6215116c9842379 SHA-1: d024acd62c594c71ae33116e0fc1f445b4dba620 SHA-256: 26bf56a727eddcbec329cae2c62f5cf012706d82be7b5536424af70a36b8dc81
146 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that leads to a suspicious domain, likely intended to host malicious content or facilitate phishing. The heuristic 'SE_CALLBACK_LURE' suggests a pretext for user interaction, possibly to trick them into further engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/123?utm_term=que+es+b%25C3%25BAsqueda+avanzada+de+informaci%25C3%25B3n PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zeladejan.pbworks.com/f/32533580742.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c535253-4078-4896-9e63-23c06b22123a/how_to_cancel_a_jitterbug_phone.pdfIn PDF document text
    • http://zelovoguvunu.pbworks.com/w/file/fetch/144427368/dark_flippy_x_reader_lemon_wattpad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ab6d6a7-7852-47c1-8ffe-156459a01604/how_to_clean_m50_gas_mask.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ead38c1d-6768-44f0-a268-1aeb90b9b2d8/sobuwiwakofojofafuje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7e671a3-9d8e-4f2e-9ad8-597e5348e652/tizemepodikaxapo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b63b903a-687d-4f84-a1f5-3fc625f620a6/caller_name_location_tracker_apk_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77d9d53e-0c84-4264-bfe5-4b1989cefeaa/skyrim_xbox_mod_load_order_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/780921ed-a641-4e89-8fb3-6b31eca0c8c8/how_to_adjust_luxpro_thermostat.pdfIn PDF document text
    • http://fubajulak.pbworks.com/w/file/fetch/144426345/binocular_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a250f39-a05f-4f9b-b33e-8950eaaf99f9/82816939659.pdfIn PDF document text
    • http://sewafebi.pbworks.com/w/file/fetch/144423789/integrated_chinese_workbook_answers_4th_edition.pdfIn PDF document text
    • http://pobonagul.pbworks.com/f/63640894212.pdfIn PDF document text
    • http://barumena.pbworks.com/w/file/fetch/144441021/las_5_heridas_del_alma_lise_bourbeau_descargar_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba69f4e8-3024-4fe6-8a79-19899825165d/what_is_the_formula_for_calculating_surface_area_of_a_cylinder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27ba8d82-b1e2-4386-834f-69e0d45128e8/the_time_travelers_wife_full_movie_in_hindi.pdfIn PDF document text
    • http://vawijoj.pbworks.com/f/vopadotokugubarova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/565bd035-5d3f-4120-a0de-af5c3c692985/86729300087.pdfIn PDF document text
    • http://mizunebapod.pbworks.com/f/3712166869.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b07684e-65a0-40d4-b21e-94104ad0af8f/70167097479.pdfIn PDF document text
    • http://bilabegape.pbworks.com/w/file/fetch/144442908/amtlib.dll_illustrator_cs5_64_bit.pdfIn PDF document text
    • http://mumubib.pbworks.com/w/file/fetch/144413319/52491265280.pdfIn PDF document text
    • http://moxulolo.pbworks.com/w/file/fetch/144441615/71871564708.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC9 5824 bytes
SHA-256: 940c85efd20772feb9aace1036a0a861ab4c15dcaf910e16b406c17d726ec13a
font_01_sfnt_off00011016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11016 12000 bytes
SHA-256: 69c55eae45fc7d681c6c9c3788b84f709b280f4797ca250fbbb9ba1e282a2eeb
font_02_sfnt_off00013753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13753 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501