Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc95c9b9d36745f1…

MALICIOUS

PDF

74.7 KB Created: 2021-03-23 16:39:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 20365e259d4ea3b78a55f515b763f887 SHA-1: aee7467d04dac1c21b12b5dc6fefa89081924063 SHA-256: fc95c9b9d36745f12d483690e3bb131629179a322b7a1fa04f4f27fda099f283
126 Risk Score

Malware Insights

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

The file is a PDF containing multiple embedded URLs, one of which, 'https://vilenefex.ru/award?keyword=biochemistry+by+satyanarayana+pdf', is flagged as suspicious and is likely the primary lure. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to 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
  • 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://vilenefex.ru/award?keyword=biochemistry+by+satyanarayana+pdf PDF link annotation
    • http://gmetry.online/61824021890ycqaz.pdfIn PDF document text
    • http://mexicotop3.xyz/best_quran_with_english_translation_bookjgaw0.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/tijowo.pdfIn PDF document text
    • http://decideyouself.fun/codigo_binario_definicion_informatica1ol42.pdfIn PDF document text
    • http://autocredit.moscow/suvuko3dhpk.pdfIn PDF document text
    • http://cenderaoriginator.com/87919158868xrsd3.pdfIn PDF document text
    • http://awpmode.com/moto_g6_play_review_2019wjccl.pdfIn PDF document text
    • http://sdorovie-sustavi.xyz/378353596n89kb.pdfIn PDF document text
    • http://mofobawosenej.mygamesonline.org/cateye_mity_8_bracket.pdfIn PDF document text
    • http://lazadacostumercenter.com/93177361362dy7av.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/6b9e20c5-7a92-41d5-9192-eeebbe006d30/washington_post_mega_sudoku_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1e35da2-6603-4ba6-883e-54745c09abc8/pomixawitudunuked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00f6c207-71ed-4eed-989a-22764be35aa7/what_should_be_included_in_a_nursing_assessment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d425542c-9133-48c6-8479-d484c487a9f1/35933658959.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4426f3d0-f226-4210-9297-90273ca7d116/msds_sheet_for_clorox_disinfecting_wipes_orange_fusion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c830b711-e943-4e27-b5ad-ac7b923968d2/2013_dodge_avenger_drive_belt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfeeded8-1cf3-4f43-b2da-15235846e75b/xufukevomuwutuneve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0502bdbc-342b-4c17-a06c-39b4ee3a1333/my_samsung_washer_keeps_going_off_balance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85dda8ee-8336-475e-98ad-6ec9b519e8ab/what_is_the_difference_between_a_team_lead_and_a_supervisor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d6000c1-c318-46c3-806f-44a5390a24de/my_verizon_fios_remote_wont_change_channels.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed57d394-25fa-4efb-a3bd-e38f3c4b2949/vocabulary_from_latin_and_greek_roots_unit_2_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d170e74a-ae06-44eb-b58d-1396f422f75b/pokemon_fire_red_cheat_rare_candy_in_mart.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_off0000e69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69B 5652 bytes
SHA-256: a6600c7d567fdc54f03952e6f38e907177a4d55ff00a82546ae0f33f3dbd86fa
font_01_sfnt_off0000f9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AF 10524 bytes
SHA-256: 15ffe893472d8d5752920a940e4ae1d4925f5f86bc4081d39ff004a4669ed87b