Malicious PDF — malware analysis report

Static analysis result for SHA-256 43381cfbc7aa3f8d…

MALICIOUS

PDF

77.4 KB Created: 2021-04-05 22:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 800b2531f3e35124e1912a7319e69205 SHA-1: 0e6200e410595a55cbf04de371046f5a54344019 SHA-256: 43381cfbc7aa3f8d02309e942a0f4bc8b4d63baaaa490b81fa5e2314ddc34492
174 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The 'SE_CALLBACK_LURE' heuristic indicates the document contains a phone number intended for callback phishing or tech-support scams. While no scripts were extracted, the embedded URL and the nature of the lure suggest an attempt to trick the user into engaging with malicious actors for financial gain or further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=how+to+change+ink+cartridge+canon+pixma+mg2522 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417222/normal_602027546c0fe.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/ib1hjNt/control_center_ios_14_home.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/dgdjbG2/bowling_3d_games_free_download_for_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379616/normal_604d394c7ec1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424025/normal_5fd04949d097f.pdfIn PDF document text
    • https://cdn.sqhk.co/tolononof/ijYktie/miui_dialer_apk_for_mi_9t_pro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414172/normal_60485bef1ac3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486054/normal_5ff9636eb3d73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365542/normal_5fd6f9cf8967f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404750/normal_6049466c0f199.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420459/normal_601ec711bb4dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462065/normal_6068904f6ec77.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/AQX0gcZ/fish_aquarium_decoration_plants.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475725/normal_5ff5fe6fa5fa0.pdfIn PDF document text
    • https://cdn.sqhk.co/fefuxumito/NiaQsjd/one_news_now_covid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408720/normal_6031105320b63.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/juvosi/best_website_templates_for_software_company.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/2004_yamaha_kodiak_400_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/6116220547.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/20314176966.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/voice_call_app.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_off0000ed94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED94 5716 bytes
SHA-256: 61ccb96b2c6d28d1961d73fb1a88b1fe620abe598ebdf1ae7cd7dfacea36aff2
font_01_sfnt_off000100fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FD 11468 bytes
SHA-256: cd150e4f732646a6736d16dd32ce2b9059de1c85abdd1030a834db99acca629f

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