Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e65903f66ff88eb…

MALICIOUS

PDF

78.1 KB Created: 2021-05-10 08:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ed37c76d222421a9736b7dc4567b08c8 SHA-1: a8feb71e52df3ca6aa2874c40552f1cd1c0c9b6b SHA-256: 5e65903f66ff88eb764cb91239980f268af5c7b1067886fa3cdda60c1b778840
146 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of a 'Callback phishing phone lure' heuristic strongly suggests the document's intent is to trick the user into calling a fraudulent number. While no scripts were extracted, the PDF structure and embedded URLs point towards a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • 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) or Microsoft license-boilerplate 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://kuzutuzo.ru/strik?utm_term=nixon+time+teller+p+strap PDF link annotation
    • http://natbeach.space/1594181113k7mjf.pdfIn PDF document text
    • http://specialsale.info/cambridge_dictionary_english_spanish_downloadlt9it.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498994/normal_5ff1ef0ab4db4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453118/normal_600cf19571dfc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424331/normal_5ff9c03aec5c8.pdfIn PDF document text
    • http://bafedudovodamo.medianewsonline.com/tukeje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471474/normal_605d8487a14ad.pdfIn PDF document text
    • http://vugaganopofom.mypressonline.com/positive_behavior_support_strategies_for_parents.pdfIn PDF document text
    • http://muxoman.mygamesonline.org/73883918017.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443588/normal_5fdf54ed2a723.pdfIn PDF document text
    • http://fresh-ita.fun/cursos_gratis_marketing_digital6pam7.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/bfdbfafe-4b88-44da-94fa-7a22b902c4c5/quality_management_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/when_you_have_tried_your_best.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/network_marketing_presentation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/333e57e7-390c-4619-b827-882740df79a8/dunkin_nitro_cold_brew_nutrition_facts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b16e6a5-6309-4bfe-98d0-d48e3a0cc8fb/the_wim_hof_method_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b38be3f-2abc-48a8-bba9-0a17801198c1/calories_in_arbys_chicken_salad_sandwich.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdc400ac-af33-4904-a4e4-7c1416c36dc3/4446103294.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1461e8b8-1321-4bda-8c99-8d7d9613d0eb/whirlpool_self_cleaning_water_cooler_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f488a90f-592d-4ed0-951b-32d4cef1a507/vavinitizi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b384f9d9-be87-4010-b5e4-19b61dfe0c2c/49819598460.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/tomudagilen.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/advertising_and_new_media.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/braums_nutrition_information_brownie_fudge_sundae.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19ae72e3-af73-4cf0-8bd9-ca73569405d8/podemopamupodopa.pdfIn PDF document text
    • http://vawanumezal.onlinewebshop.net/singapore_work_permit_visa_application_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5ca9dd9-51ba-46ef-8790-f8b8d1258d82/jafuwemawuxotevejesa.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_off0000ef82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF82 5000 bytes
SHA-256: 2a9f74163d7a1c910b0e2c55aa64117265480d7a478092283ba78c60c14aa217
font_01_sfnt_off00010070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10070 12812 bytes
SHA-256: 5655f9ef45fb7b50ffaae3cbfa4742ce0bd113927d55f8e99a0fced754a01efd