Malicious PDF — malware analysis report

Static analysis result for SHA-256 795ce790509e3786…

MALICIOUS

PDF

108.8 KB Created: 2021-05-29 22:41:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: cbb881543f90d69a477af5ed4f4432f1 SHA-1: d33d8c936a954ac47b28a7f8d020b387ba5c1a29 SHA-256: 795ce790509e3786491c026ffba4611260399547c874cb1d3fbf254f8275b598
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the primary external links is to 'ponafet.ru', which is suspicious. The document body is heavily garbled, preventing analysis of its specific content or purpose beyond the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ponafet.ru/123?utm_term=dj+ka+full+form+kya+hota PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413363/normal_5fc5aa27ef9f7.pdfIn PDF document text
    • https://zopamege.weebly.com/uploads/1/3/5/9/135966764/6422d787a.pdfIn PDF document text
    • https://fenatafu.weebly.com/uploads/1/3/1/6/131637570/6677507.pdfIn PDF document text
    • https://penixosifa.weebly.com/uploads/1/3/1/4/131482878/xufofed_fobaforusodola_bilizamet_gedurodalevo.pdfIn PDF document text
    • https://tovakuroxi.weebly.com/uploads/1/3/1/1/131164121/leximide_vimow_wamorupok.pdfIn PDF document text
    • https://vuvowopivuvi.weebly.com/uploads/1/3/1/4/131410126/2c4b8fc2be9e563.pdfIn PDF document text
    • https://xolavubapipivuk.weebly.com/uploads/1/3/5/3/135302485/jebutupupubozufij.pdfIn PDF document text
    • https://rupijike.weebly.com/uploads/1/3/5/3/135312351/nuwelun_fijewudogowe_karif.pdfIn PDF document text
    • https://pujezifug.weebly.com/uploads/1/3/0/7/130738771/pumilibubebur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390366/normal_605cac4dc18c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417222/normal_6016309ed6ee1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490273/normal_601691311b362.pdfIn PDF document text
    • https://bosagibanili.weebly.com/uploads/1/3/2/6/132682134/9edbf9.pdfIn PDF document text
    • https://zukifetev.weebly.com/uploads/1/3/4/7/134725253/litufudopaforuwetuki.pdfIn PDF document text
    • https://kuwisuzom.weebly.com/uploads/1/3/4/0/134017610/512778.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7319115-6a9f-47b0-b8de-ef6893bf36ec/bidavipajozozogafubawu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c73f68ee-5b24-4f8d-a2cc-635796c92f10/20274182150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a1a6989-9c25-4e2f-bf85-821fb4313306/what_is_introduction_body_and_conclusion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54e70d7a-632a-4619-91a5-c4a32eceb8b6/langston_hughes_educational_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/298b2343-339a-44b4-b82e-a7bf9c811a12/44042598684.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaa30d20-ff7d-4e45-b124-523b48aad84a/xakenafofopipojomidelideg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/144a086a-65c8-484f-b854-6649f6ce501d/computer_hardware_lecture_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2b140f9-8e70-4f63-aa52-f8c95fb342a4/corporate_identity_advertising_agency.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8efc383a-bc39-4382-a1e4-8fff1e641d30/56291723167.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13854 5068 bytes
SHA-256: 0fb7e47840f88e5a0abcad12d26b727ecc60a1ead50c789fdda6141ef4c0c665
font_01_sfnt_off0001497f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1497F 3720 bytes
SHA-256: 6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed
font_02_sfnt_off000154e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154E1 9976 bytes
SHA-256: 5998d06f653d4b769ba625f1970fd288a81112b2ed59ee961c42e5a4fd5d26ba
font_03_sfnt_off0001773b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1773B 14504 bytes
SHA-256: 895446310d4f0996b2ea9832de44a9ead624dce01c378ffbc1ffcc19429af5db