Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff364aa6f098a4d…

MALICIOUS

PDF

83.6 KB Created: 2021-03-05 11:56:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 70664016863d743645eee214888b3419 SHA-1: 28c80b2ebb716886a8e186fcdcb5e6c853b939d7 SHA-256: bff364aa6f098a4df9e1f029ef33aaf6c802c3e23013391a3b672f26de4572c2
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The 'SE_CALLBACK_LURE' heuristic suggests the document is designed to trick users into calling a fraudulent phone number, a common tactic in callback phishing scams. While no scripts were extracted, the PDF structure and embedded URLs point towards a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://zajinet.ru/award?keyword=a+dance+with+dragons+jon+chapters PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470409/normal_6034a26588c04.pdfIn PDF document text
    • http://bobejitamatu.iblogger.org/29855993144.pdfIn PDF document text
    • https://gomimujexewawid.weebly.com/uploads/1/3/1/0/131070583/8752774.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447108/normal_60035cecbbbf2.pdfIn PDF document text
    • http://zuzudijibogojag.22web.org/weather_app_free_for_mobile.pdfIn PDF document text
    • https://muwunijika.weebly.com/uploads/1/3/1/3/131398004/c1cdb0ba4df.pdfIn PDF document text
    • http://zefujixa.mywebcommunity.org/rokeme.pdfIn PDF document text
    • https://bezumovepefare.weebly.com/uploads/1/3/5/3/135337037/ca32d.pdfIn PDF document text
    • http://ketaton.mywebcommunity.org/gelug.pdfIn PDF document text
    • http://kobivoweder.mypressonline.com/naeyc_standards_2020.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/6efadd92-4b53-4405-b8f6-1068d8387ebf/harbor_breeze_customer_service_phone_number.pdfIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/80922627708.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b1c1d7d-69fd-46d1-bf0d-1c15c50e956c/35210602207.pdfIn PDF document text
    • http://medomapex.epizy.com/bosch_battery_tester_bat_121_manual.pdfIn PDF document text
    • http://ribizotujigotok.rf.gd/ayushman_bharat_hospital_list_in_mp.pdfIn PDF document text
    • https://504706c9-3a86-45eb-876a-6494ef133fff.filesusr.com/ugd/80c1db_46367ae8cb9f478abd21b636ef7f6859.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cebe0b8a-cc94-45cf-a82e-723c7f75ed36/ham_radio_license_manual_4th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55cb28e9-9964-4698-8e2e-999235aa6516/daily_english_conversation_practice_by_topics.pdfIn PDF document text
    • https://2dc0326d-ac60-47d8-bf46-f2dc9d334570.filesusr.com/ugd/21b4a7_1243454c41654a9da71a88b6886c025c.pdf?index=trueIn PDF document text
    • https://d4e73f68-9870-4c81-be0c-0a6dd7607cd2.filesusr.com/ugd/6f53d7_4325774d15814a4f9a75e4297520f7e1.pdf?index=trueIn PDF document text
    • http://newemepakirid.myartsonline.com/ruliwadef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25827900-eea2-4052-b41a-cf426950cd33/surah_al_mulk_by_mishary_al_afasy_mp3_download.pdfIn PDF document text
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_6c16fc95628b4c20a4474b04b5df9f08.pdf?index=trueIn 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_off00010719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10719 5460 bytes
SHA-256: ba322c44583900a01b6adead1bb9c170f921a8e97ad5d2bc8b0c21bbbdf34c3a
font_01_sfnt_off000119be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BE 11672 bytes
SHA-256: a237bf4a9a1ee4a2830857cdf651323f9bc7ed1f5986dc08674a247bb6e96b1c