Malicious PDF — malware analysis report

Static analysis result for SHA-256 74064fec3d711100…

MALICIOUS

PDF

71.6 KB Created: 2021-06-11 04:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 51ac6e8cbe1ee186233df8acf2b70994 SHA-1: a85ade3d5083799046f275e4753a16ac65bb4351 SHA-256: 74064fec3d71110081c68ad354f21db129eac5a6db06c92b151e822cc671b9e1
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to potentially malicious content, as indicated by the high-confidence ML classifier and ClamAV detection. The primary malicious URL identified is https://drafthe.ru/pbw, which is presented with a lure related to movie downloads. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://drafthe.ru/pbw?utm_term=tamilrockers+2019+kannada+movies+download PDF link annotation
    • https://suniponemiviku.weebly.com/uploads/1/3/1/6/131636748/2522a4.pdfIn PDF document text
    • https://zojegidaluvimov.weebly.com/uploads/1/3/4/1/134109086/gexesi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kapetipubi.pbworks.com/f/gifford-mcmahon_gm_cryocoolers.pdfIn PDF document text
    • http://tusoxefum.pbworks.com/w/file/fetch/144766902/worlds_easiest_game_2.pdfIn PDF document text
    • http://gujavitax.pbworks.com/f/pujitodudekokujigesipo.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/w/file/fetch/144445083/what_is_mandatory_reporting_in_disability.pdfIn PDF document text
    • http://nuwiwaweber.pbworks.com/w/file/fetch/145074579/zncl2_ionic_or_covalent.pdfIn PDF document text
    • http://domewisisu.pbworks.com/f/how_to_return_items_to_walmart_without_a_receipt.pdfIn PDF document text
    • http://dijakezepo.pbworks.com/f/petaxowapirebatumi.pdfIn PDF document text
    • http://zipiwume.pbworks.com/f/nezilofuwimujiminibo.pdfIn PDF document text
    • http://nagaxop.pbworks.com/w/file/fetch/145099503/korean_language_learning_in_nepali.pdfIn PDF document text
    • http://pevozowo.pbworks.com/w/file/fetch/144423777/birir.pdfIn PDF document text
    • http://zixawedeg.pbworks.com/f/ssx_3_iso.pdfIn PDF document text
    • http://fijinatuzut.pbworks.com/f/self_performance_review_sample_for_nurses.pdfIn PDF document text
    • http://zidedabi.pbworks.com/f/tristan_thompson_cheating_on_khloe.pdfIn PDF document text
    • http://vulazojab.pbworks.com/w/file/fetch/144909459/18422451782.pdfIn PDF document text
    • http://nonesupul.pbworks.com/w/file/fetch/144554556/volume_and_surface_area_of_a_rectangular_prism_worksheet_answers.pdfIn PDF document text
    • http://maxasol.pbworks.com/w/file/fetch/144537060/inventario_de_intereses_vocacionales_cirino.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_off0000da82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA82 5732 bytes
SHA-256: 5ab57680f58e7728709c11deac52fcda407983453c00039407d908441aa9b93b
font_01_sfnt_off0000ee06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE06 10556 bytes
SHA-256: 9f44cdd5c2b65adccc0c383a6d4b39821959a88d0fd309620b2cdf781f50b06e