Malicious PDF — malware analysis report

Static analysis result for SHA-256 63367b2ea7e99c75…

MALICIOUS

PDF

76.4 KB Created: 2021-03-15 12:28:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: bca0bdd54b1893f012e8bbf6c7f2035d SHA-1: 59446ac628857018e87d88c3ca3d277919271e23 SHA-256: 63367b2ea7e99c7506980a5b0cb4d5fe8b0a22a7a9d5c16683bb25e8c8423247
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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.
  • 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://druttle.ru/award?keyword=types+of+nouns+in+english+grammar+with+examples+pdf PDF link annotation
    • http://wamepiguvoj.iblogger.org/43333894293.pdfIn PDF document text
    • http://lefuduzitenazig.22web.org/29040667434.pdfIn PDF document text
    • http://vuwadezizubem.22web.org/baseball_hall_of_fame_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/duzoxibuf/jcEJKEh/microsoft_365_admin_app_intune.pdfIn PDF document text
    • https://cdn.sqhk.co/tirabipati/UZjjjjD/nes_duck_hunt_dog_gif.pdfIn PDF document text
    • http://sadesopawu.iblogger.org/53842479419.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/2972cd24-cbc5-4591-8b82-bdfe7a71d81e/kindle_fire_hd_7_3rd_generation_root.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49a68237-c0b9-4830-9734-d0d63810528a/96426439117.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/17499131168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b04dd050-6952-4b4d-8d9d-a075e1323225/what_does_le_grimoire_mean.pdfIn PDF document text
    • http://zuriromaruwo.epizy.com/46780991454.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ca4a753-e76f-46c5-b7c1-6ad0ef1eb07b/hands-on_machine_learning_for_algorithmic_trading_github.pdfIn PDF document text
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_cc22caa4312d46dfb88ba1076904f4ad.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/bunowejumo.pdfIn PDF document text
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_08bff301fbfd483495f3fbbb74643048.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sitok/casio_exilim_battery_np-20.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/raxoporarobuvopuwaxaxepip.pdfIn PDF document text
    • http://pebulibupa.rf.gd/nawumomawumidusikovofapa.pdfIn PDF document text
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_5702ca1e59944e968fed940b33ee8abb.pdf?index=trueIn PDF document text
    • http://gozudivigel.epizy.com/classifying_polynomials_degree_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f52d8824-853f-4db4-8abe-da123099ea52/85340816464.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/64710773284.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_off0000e893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE893 5664 bytes
SHA-256: ae29aef5053623b8cf35c8cc628346dc3c8019456ef58bdfe7f712fb685ece75
font_01_sfnt_off0000fbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCB 11256 bytes
SHA-256: 905fa0bc756a71bc89291446e8d2f4e38f5356ee2b3117d0d8b1483140583b9a