Malicious PDF — malware analysis report

Static analysis result for SHA-256 20067c89228a12f1…

MALICIOUS

PDF

77.0 KB Created: 2021-05-01 17:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 339e179857acfd8624af4af4853ac316 SHA-1: a3b0a97e4f91615ab998d48ca5f08e96a7ea6225 SHA-256: 20067c89228a12f197e303b225b3d522426de385da9d24a5d603e87155e8fa06
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The presence of embedded URLs and the PDF structure indicate it's designed to redirect users to potentially harmful websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=the+worry+cure+pdf
    • https://cdn.sqhk.co/zajagatetode/iYg8sp5/best_app_vault_for_iphone.pdf
    • https://vipogonegope.weebly.com/uploads/1/3/0/9/130969266/a7c50447dee8d1.pdf
    • https://cdn-cms.f-static.net/uploads/4388613/normal_603b790adde53.pdf
    • https://fisomekoxow.weebly.com/uploads/1/3/5/3/135326807/matow_dugurebavuriva_wodibonekubuza_nodijewemipap.pdf
    • https://cdn.sqhk.co/xuvisisitinu/iiggiie/takeout_restaurants_near_me_drive_thru.pdf
    • http://rivilidopu.medianewsonline.com/kodak_printer_esp_3250_instruction_manual.pdf
    • https://cdn-cms.f-static.net/uploads/4413578/normal_60629df4ec895.pdf
    • http://gazedalepi.sportsontheweb.net/bohr_s_atomic_model_postulates.pdf
    • https://tofeniva.weebly.com/uploads/1/3/4/6/134625175/rixezepatufe.pdf
    • https://sapuvitajesi.weebly.com/uploads/1/3/0/7/130776539/3314704.pdf
    • http://allerop.xyz/6225172487961rs6.pdf
    • https://sebigazawipad.weebly.com/uploads/1/3/0/8/130814057/8696156.pdf
    • http://tryadasert.online/nexonzrvux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/89e9bd30-a0be-4285-9b10-a36670204da2/agilent_34401a_serial_communication.pdf
    • https://uploads.strikinglycdn.com/files/ccde76fe-091e-4bb2-8ef0-d938188a5c35/amazon_kindle_instructions.pdf
    • https://uploads.strikinglycdn.com/files/a90e3cb7-1fb6-40e5-a346-82e486010754/line_6_pod_xt_pro_rack_mount.pdf
    • https://uploads.strikinglycdn.com/files/21be6461-9110-401c-af0b-339105ef7d17/grade_3_nelson_math_textbook.pdf
    • https://uploads.strikinglycdn.com/files/3383683d-7d78-49a4-99ea-39a4895d4a6d/33948845699.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e470.bin
1679e836b49fcfc93dcd7dbbc6381d44ac6a917c52352751b9fa4e310445b808		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE470 4616 bytes
font_01_sfnt_off0000f445.bin
339dd71ad99103556d0143bd0c352c137b7bb501fd69590476b149bc03b4b3f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF445 10316 bytes
font_02_sfnt_off00011791.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11791 4324 bytes

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