Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf6ea39ab94888db…

MALICIOUS

PDF

71.0 KB Created: 2021-05-31 15:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 06b934418413edabe65d5e375f5efa09 SHA-1: 72f6a00741c69f28aa115865c1c895ebd12fba14 SHA-256: bf6ea39ab94888dbfe70108d249822c8d45ef9a296a8d61e5cf9d8e41fd8b5d8
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 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/pbw?utm_term=how+do+i+know+my+motorcycle+inner+tube+size PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479445/normal_5fd263afc1490.pdfIn PDF document text
    • https://fogoranamixite.weebly.com/uploads/1/3/5/3/135390362/lijuluzojo_wexatupumar_webir_mosigu.pdfIn PDF document text
    • https://domemasajexal.weebly.com/uploads/1/3/5/3/135304114/wiwam-tubizom-sepejov-todube.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426425/normal_5fe3a466ae36f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425727/normal_60559f5bf3100.pdfIn PDF document text
    • https://webojese.weebly.com/uploads/1/3/0/9/130970005/pisofofexe-rupepugitekin-jijisurudiban.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499958/normal_600533fad9bcf.pdfIn PDF document text
    • https://lolidinol.weebly.com/uploads/1/3/4/8/134884516/kokirekisa-jutitigujino-tebikuvujaku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500183/normal_5fca1937736d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489843/normal_6047ef5a39f24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369760/normal_6049ccf0c2a16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404987/normal_5fea233bb1a1c.pdfIn PDF document text
    • https://dodojojika.weebly.com/uploads/1/3/4/5/134503072/nabipikasawovuvu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419654/normal_601d27f6518ce.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/28a2c1df-b189-4183-871f-3d1781273bf4/dujukudixuvosugewedutit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b98cbb9-4abc-499d-aa81-3de71fd5d9c3/hp_officejet_5610_printer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e03a1d9a-9763-431c-9fd5-92827b55d415/computer_components_shop_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55df6885-d919-4268-81ee-b613c154d9cd/how_to_find_working_capital_from_balance_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b0a86cb-e07f-4baf-bd1f-62cd1e5edf57/nibizakifutaludivanavewuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/836aa40f-1baa-4cd0-a629-6ed7ba833820/firojomobaluki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/468aebc2-330e-4df8-bec4-fbe7b62abf7a/fahrenheit_451_book_vs_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b9f806f-e7d5-45de-afd4-b712cadd44da/black_and_decker_mouse_sander_instructions_ka161bc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd99737d-ebc5-4791-b87b-5297f8a936b5/26821691621.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_off0000d4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F6 5284 bytes
SHA-256: 854983fbf316ad2544cc8fb623cb18d1c93e222e1ff26742778c8ec58d22a4d3
font_01_sfnt_off0000e6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F8 11404 bytes
SHA-256: 48fca547927b1e119308dcedbf245263a78f91f23ffb0ae77e4da476713543e2