Malicious PDF — malware analysis report

Static analysis result for SHA-256 780cdbb6cf9e297b…

MALICIOUS

PDF

79.2 KB Created: 2021-04-04 22:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 71664141709cd1c8f3e5796552c229a1 SHA-1: 8a1e988bda368268827d172795096e2540046747 SHA-256: 780cdbb6cf9e297b4f97086a3fe7e97126f6467c648a9ca89a7da602f3f05086
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 0.9994

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 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://fokemale.ru/123?utm_term=bewafai+video+song+mp4 PDF link annotation
    • http://1xbets-regs.site/91994399392p6bdj.pdfIn PDF document text
    • http://mitsumoro.ru/how_to_install_dishwasher_bosch8uur2.pdfIn PDF document text
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/puxisiwesosumoczg2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://233b4d2f-9c44-4004-b776-098ebc281e6f.filesusr.com/ugd/7f980c_b95f14fd8eaf436a9fc5379af5f307f3.pdf?index=trueIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_d0157d51ca904f3e97a6e2b125b66e71.pdf?index=trueIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_324f2143207740e0a6afea1a3d4b4882.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/pegabamogaxejepazodejokin.pdfIn PDF document text
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_f03d2a28aaf44f0b96b56f91775924a3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/vurebigututofewenobixiril.pdfIn PDF document text
    • https://cb47f074-0476-4434-b381-5672a365cab8.filesusr.com/ugd/c46c8a_9066428d9e4f4c22a126a2da0e8ed7b3.pdf?index=trueIn PDF document text
    • https://1bf92926-22d0-44a1-94fb-b51843c41cd5.filesusr.com/ugd/762c1a_55e187b76e7045abb1a52aa1057f7097.pdf?index=trueIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_e71cba5ce8fa46e59db04e18eaaa392f.pdf?index=trueIn PDF document text
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_244648fb062443a3923110e598c35344.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fed5862d-63fe-456d-8c10-c44feda5b8ac/vba_programming_tutorial.pdfIn PDF document text
    • https://27dd58ca-3bab-4825-b0a2-cb75a9f796de.filesusr.com/ugd/aba4c5_4e092da37b9c4688ad41885ca7d0d41d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb23929a-0d8b-4eee-a79d-bbe915409597/how_is_baby_gender_determined_by_blood_test.pdfIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_7468b44c88504521b5dfc4cb35179b95.pdf?index=trueIn PDF document text
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_2ee9881d4b774c6bbf319f577db46a08.pdf?index=trueIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_b36e9ab591524b24b6eb290af7f964dc.pdf?index=trueIn PDF document text
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_080a70518b52499ba5ec6af0dff46e50.pdf?index=trueIn PDF document text
    • https://ecfc1f44-6648-4072-bff5-6ee4adcfbe4f.filesusr.com/ugd/e5a943_0ef609e5a44d4fd9844a7b51c882eda4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/276676a6-98a3-48c5-a235-75b86eabeae3/what_do_colleges_want_to_see_in_recommendation_letters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/395c7329-c4ff-4fa5-8a46-f17f5f3e228a/sitobatuze.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_off0000f524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF524 5524 bytes
SHA-256: a7d607ab79daa5ababbecfa63604020c7fc034b2f80442df00ec02764ab892b2
font_01_sfnt_off00010811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10811 11764 bytes
SHA-256: 7faa2f0768791668bc102e267611b4c07f70559bc6b11ae38ac42244109d819c