Malicious PDF — malware analysis report

Static analysis result for SHA-256 f917dd9eac6aa500…

MALICIOUS

PDF

130.5 KB Created: 2021-04-23 14:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 14b4a233ff4442d3d85aef309ba9504a SHA-1: c8e258f95fd1a049b6f37d5daa7cd896268368df SHA-256: f917dd9eac6aa500bc09031cd20e4e23623693d3d79698d115453d6b61d81c50
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are indicative of a phishing or link-farming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically classified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with attempts to lure users to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/strik?utm_term=les+miserables+1985+cast+recording PDF link annotation
    • https://cdn.sqhk.co/vasozaponem/S2iibdz/5_cubic_foot_chest_freezer_menards.pdfIn PDF document text
    • https://cdn.sqhk.co/xexerekija/jZ4jggf/lademak.pdfIn PDF document text
    • https://cdn.sqhk.co/loxexafetivu/Mibhfje/rubowituzomumijedopo.pdfIn PDF document text
    • http://limecash.xyz/zadomaxivixatohh0m.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/usCihfR/luposaxijorowufo.pdfIn PDF document text
    • http://tublitalia.fun/pezusadorufedebitar65o7w.pdfIn PDF document text
    • http://haustova.com/shakespeare_macbeth_act_1_scene_3_translation7o4a7.pdfIn PDF document text
    • https://cdn.sqhk.co/zalivelo/jJMfnBN/pusijapegojiz.pdfIn PDF document text
    • http://abistrans.ru/12136793118i43fb.pdfIn PDF document text
    • https://cdn.sqhk.co/fugutexifi/Pjj87jh/jawaban_troll_face_quest_unlucky_level_18.pdfIn PDF document text
    • https://cdn.sqhk.co/nenuguvan/zjgiaGb/10641703433.pdfIn PDF document text
    • http://tactical-jacket-sale.shop/how_to_paint_a_theater_room7xlmm.pdfIn PDF document text
    • http://cartest.pro/73023874883liqiw.pdfIn PDF document text
    • http://prequester.online/2006_harley_davidson_sportster_1200_custom_service_manualiqu4l.pdfIn PDF document text
    • https://cdn.sqhk.co/jokawefezo/fKcxhb9/dragon_x_dragon_reader.pdfIn PDF document text
    • https://cdn.sqhk.co/xilasexiki/iodijfW/florida_trustee_distributive_deed_form.pdfIn PDF document text
    • https://cdn.sqhk.co/zirigajer/YghVVWv/miro_clash_of_clans_hack.pdfIn PDF document text
    • http://optalpha.com/master_gardener_manualxknpe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b6e3a945-3697-4bd8-ab61-454558667325/how_much_to_change_sump_pump.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73fb694d-1bf2-4f9e-9ff2-c82ac2aa3257/how_to_be_a_good_christian_mother.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001afda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFDA 5652 bytes
SHA-256: 1b03aba2ae9e943abc710d87e2cd348e9210123f84c228220a5524ee2d032b20
font_01_sfnt_off0001c2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2E8 12376 bytes
SHA-256: 440753362a63aff0c13bd2ec3f153fe82827cd1a0de55e758057bca343dc52e9
font_02_sfnt_off0001ec77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC77 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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