Malicious PDF — malware analysis report

Static analysis result for SHA-256 8addb4a95f74ceba…

MALICIOUS

PDF

81.6 KB Created: 2021-03-29 16:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f92977bb9b319d185dc0044906ef221f SHA-1: ce70e79a3c574c18237b1444d0d4ca6607fe616b SHA-256: 8addb4a95f74cebae04bb137df4f9d7b363968bd8f818191f3c45dd21ad071b5
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious infrastructure, specifically `https://dafemum.ru/award?keyword=bible+message+for+youth+in+tamil+pdf`. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=bible+message+for+youth+in+tamil+pdf In PDF document text
    • http://liwexun.mywebcommunity.org/chromatic_harmonica_chart.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369922/normal_5fd30666a2470.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478933/normal_605d57e89393e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419218/normal_5fed78a29c924.pdfIn PDF document text
    • http://dipenoguzel.sportsontheweb.net/50157879609.pdfIn PDF document text
    • http://giwudogor.scienceontheweb.net/11564400126.pdfIn PDF document text
    • http://vowuzemiru.medianewsonline.com/cash_flow_statement_multiple_choice_questions_and_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369329/normal_6005a92480b04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479691/normal_6004e9cdd21d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382414/normal_6035300c3787f.pdfIn PDF document text
    • http://vofufime.mypressonline.com/que_es_ser_un_buen_lider_empresarial.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://ac402fee-74f4-49a6-b5a4-6a03c6a057de.filesusr.com/ugd/b0cd75_a7185d0804ad4862b8eb5a429fc1e971.pdf?index=trueIn PDF document text
    • http://nukilaba.myartsonline.com/73304382887.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ae80d90-22db-48e9-ae05-72e470d29571/56868476311.pdfIn PDF document text
    • http://timojodabemisux.myartsonline.com/vevakap.pdfIn PDF document text
    • http://kopolug.myartsonline.com/fikutopelowujiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85e8a2cc-aaf4-4dde-9fe0-026cbd74fc62/what_size_micro_sd_card_for_galaxy_tab_e.pdfIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_0630bc21696348fca17823d1c62b8650.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ec8e471-625a-45d7-984a-a2bc4323863a/how_to_find_out_your_hcg_levels.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b9c93ff-744c-4867-9eba-595d732bc8f6/how_much_does_it_cost_to_maintain_a_camaro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fab9236-acfa-4def-985a-df3e21defd77/what_are_the_basic_features_of_interpersonal_communication.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42E 5628 bytes
SHA-256: 5672ac870213c70426fbb76f359158b51d7d16faf116863ef77ec6b41b759330
font_01_sfnt_off00010721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10721 10528 bytes
SHA-256: a4b5758b1f8243615c085678e2bb87b40114872154709ded16816b14eca3855d
font_02_sfnt_off00012b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B10 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3