Malicious PDF — malware analysis report

Static analysis result for SHA-256 50956b0e5cc906bd…

MALICIOUS

PDF

73.8 KB Created: 2021-02-13 16:43:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 010b124daf734a382b8505a5ce11e8da SHA-1: bebad534978529bb194b613ecd4e98bbaffef4b8 SHA-256: 50956b0e5cc906bd020a5b9b4ae138a1f88d12ffcf4dbab7ed13c925815807a3
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, and contains numerous embedded links. Several heuristics indicate it is a link farm hosted on disposable infrastructure, designed to redirect users to malicious sites. The primary malicious URL identified is https://crophysi.ru/wb?keyword=inequality%20math%20worksheets%20free, which is flagged as a known malicious redirector.

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
  • 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://crophysi.ru/wb?keyword=inequality%20math%20worksheets%20free In PDF document text
    • https://kowulenube.weebly.com/uploads/1/3/2/7/132740682/lukoxal_pasovid.pdfIn PDF document text
    • https://labekefetimobu.weebly.com/uploads/1/3/0/7/130739294/javepib.pdfIn PDF document text
    • http://cardioactiveitalia.site/1443256034863efv.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/ahd9jgG/retro_games_plus_orange_ct.pdfIn PDF document text
    • http://giocodigital.website/audio_video_editor_free2ga47.pdfIn PDF document text
    • https://zogoporev.weebly.com/uploads/1/3/1/3/131381602/duxigulefi.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/t7gcyja/fastsave_for_instagram_download_for_pc.pdfIn PDF document text
    • http://allrecipes.pro/download_2048_cards_merge_solitaire_modfa7fo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392441/normal_60012e3aa4df0.pdfIn PDF document text
    • https://cdn.sqhk.co/davusegeb/hj4PJhe/kushi_movie_ringtones_cheliya_cheliya_music.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370269/normal_5fedc2b15207c.pdfIn PDF document text
    • https://wigikeketiru.weebly.com/uploads/1/3/1/4/131406435/dinemu-vimufusu-susewa.pdfIn PDF document text
    • https://cdn.sqhk.co/doxufojixene/YTthcH1/55795047139.pdfIn PDF document text
    • https://kebokezuzak.weebly.com/uploads/1/3/5/3/135318209/d6c43b98610.pdfIn PDF document text
    • http://nekretnine.site/birdy_skinny_love_chordsr57y8.pdfIn PDF document text
    • https://cdn.sqhk.co/jogeguzotire/fhh7DNH/pizod.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://s3.amazonaws.com/fuvidokibet/keragaman_budaya_indonesia.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/baaghi_2_movie_trailer_tinyjuke.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/acr_call_recorder_apk_pro.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_off0000d3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B0 5212 bytes
SHA-256: 0ab975f75f08c73ea49cb017a4bd4bfd3a952e2cc1d670b30b747ffce675d2f7
font_01_sfnt_off0000e54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54E 10724 bytes
SHA-256: 50469e0d2a05928d4b75f3863f1f1ac5616373d020a44386c4e62c5499ca8775
font_02_sfnt_off00010a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A36 4324 bytes
SHA-256: ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c

Open this report in the interactive analyzer, or submit your own file for analysis.