Malicious PDF — malware analysis report

Static analysis result for SHA-256 4512f262b1b833d9…

MALICIOUS

PDF

112.7 KB Created: 2021-03-11 04:04:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9d915fc7bbb095f8cde1b823a03e8073 SHA-1: 9f976f10c1dfc2c961d30b4a0cf09398bbca87f8 SHA-256: 4512f262b1b833d94dac63a2503bfee0fa6fd5ec92d9433c52e517b7451ec470
146 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or scam attempt. The 'SE_CALLBACK_LURE' heuristic indicates the document prompts the user to call a phone number in a context of billing or security issues, consistent with callback phishing or tech-support scams. While no scripts were explicitly extracted, the presence of PDF-specific heuristics and numerous URLs points towards a malicious document designed to trick users into engaging with fraudulent services.

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://midufefew.ru/strik?utm_term=pe+electrical+power+exam+prep+course PDF link annotation
    • https://cdn.sqhk.co/nixafusoda/jbZdyje/lujatunitemozub.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/computer_programmer_salary_2020.pdfIn PDF document text
    • http://cloudplay.xyz/96054545897d5g5m.pdfIn PDF document text
    • https://cdn.sqhk.co/tebefaravuz/hbibjbn/receita_de_glace_marmore_passo_a_passo.pdfIn PDF document text
    • http://quickpapp.online/scholastic_vocabulary_packets_greek_and_latin_rootscm837.pdfIn PDF document text
    • http://suberubepuparo.getenjoyment.net/balancing_redox_reactions_examples_answers.pdfIn PDF document text
    • http://keepsufi.space/ronapasatemasudevukon3w.pdfIn PDF document text
    • http://vigetatefix.iblogger.org/graphic_design_digital_portfolio_templates.pdfIn PDF document text
    • https://cdn.sqhk.co/soziwariru/uvigbif/train_sim_world_2_route_editor.pdfIn PDF document text
    • http://merishwheelrecords.com/due_diligence_checklist_for_buying_a_business_nswj6i95.pdfIn PDF document text
    • http://nosinoski.shop/mcdougal_littell_literature_grade_7ou5cd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cc46d2ba-e7cf-42f8-aa62-b015a0c17ef0.filesusr.com/ugd/d180c3_d73df7f80555437488e16c3c657de805.pdf?index=trueIn PDF document text
    • http://bidodabamurof.epizy.com/fozaxofajeligutidigenaw.pdfIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_2b93ea206a7d45d8a1ac400d3d60e8c9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d23c6d0-da98-4d62-a44b-150ba1d65a62/battletech_game_tips_and_tricks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bffa2e3-f290-4088-827e-e95443fca68f/how_much_does_it_cost_to_have_scoliosis_surgery.pdfIn PDF document text
    • https://6f1239e7-da96-47bf-8adb-22d47a96a9da.filesusr.com/ugd/bb5a15_1469cd8c024b43c0bf0d32d758b1c3ef.pdf?index=trueIn PDF document text
    • http://tiguvazigavis.epizy.com/cryptococcal_meningitis_treatment_guidelines-_idsa.pdfIn PDF document text
    • http://wesatume.atwebpages.com/96861460431.pdfIn PDF document text
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_ae66455c3c474889bcac081b8d43a49d.pdf?index=trueIn PDF document text
    • http://mibaxeruwo.epizy.com/what_problems_can_a_bad_throttle_position_sensor_cause.pdfIn PDF document text
    • https://5d94d51b-2702-4b64-8df3-eadd022f3edc.filesusr.com/ugd/2ddd39_ad8162fda7184fa1b420a1146e3d73fa.pdf?index=trueIn PDF document text
    • http://josesomesube.myartsonline.com/59237510213.pdfIn PDF document text
    • http://jovigatuvukifi.epizy.com/colocar_assinatura_digital_em.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/919fb441-d67c-4654-a122-aa557ff586b9/85759801709.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_off000176f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176F2 5240 bytes
SHA-256: 033b56fbb7576aa00d2f61b8514f4233c603182b2c77a9779144f6e5ae03b189
font_01_sfnt_off000188c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188C1 13556 bytes
SHA-256: f80fc374c67f278ffafe249640fc256fe768fb08e953c2ae4b31af717ed4874b

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