Malicious PDF — malware analysis report

Static analysis result for SHA-256 d68dc70af21c5450…

MALICIOUS

PDF

114.1 KB Created: 2021-02-16 03:19:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: fe970bde3a413dbe6821a16520faa400 SHA-1: b48b74438b48ee6cb6b9d8b658a1d77536071c47 SHA-256: d68dc70af21c5450f077bdac9c8f7a450b7c5d6493121bee400609b125d2902c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://crophysi.ru/strik?utm_term=left+behind+audio+books+in+order PDF link annotation
    • https://cdn.sqhk.co/xakelafu/fihichc/jarimukigevasugu.pdfIn PDF document text
    • https://cdn.sqhk.co/rogumabutur/2xa6hd8/live_skull_wallpaper_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/kurotevu/Jzgdchb/u_mobile_postpaid_plan_with_smartphone_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411922/normal_5ffd6f78ab98c.pdfIn PDF document text
    • https://cdn.sqhk.co/sisadenev/qiazjdu/carson_wentz_free_agent.pdfIn PDF document text
    • http://beautysale.site/poxexgq8pd.pdfIn PDF document text
    • https://cdn.sqhk.co/juvebuzizej/jSTFjeB/cat_running_around_frantically_and_meowing.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405899/normal_60187cc4223e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379848/normal_5fec861991360.pdfIn PDF document text
    • https://xowunaxevome.weebly.com/uploads/1/3/4/6/134679103/luvil-nilaxazisuzisa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369315/normal_5ff9544f79f44.pdfIn PDF document text
    • http://kukushpa.fun/add_canvas_to_imageview_androiddp5x4.pdfIn PDF document text
    • https://cdn.sqhk.co/suvotoruwot/bOPHsja/z_nation_cast_lucy_season_4.pdfIn PDF document text
    • https://cdn.sqhk.co/powirafawume/sgfgghc/fortnite_dark_legends_pack_kaufen.pdfIn PDF document text
    • http://lnstagramcopyrigtservice.com/platform_panic_all_characters1o3pd.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/tobobowu/mibovalulijegoxudokexu.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/hdfc_ergo_travel_insurance_claim_form.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/49620797461.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/chol_gori_all_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/kathi_full_movie_free_tamilrockers.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00017726.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17726 29552 bytes
SHA-256: cf16c283003ef985a1d13c2f937847f93fa65dee71679dce27aa1bb0dae49e9e
font_00_sfnt_off0001406c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1406C 4988 bytes
SHA-256: 85566e6f1615c69c4da9b8cc77623063345f1d695df2f33350db5197e40492c8
font_01_sfnt_off0001514f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1514F 11072 bytes
SHA-256: 6f2c8cccfc53c1aa0c3856e811209887ac50bda2ee979e102cac1128572bddc3
font_03_sfnt_off0001ac0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC0D 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34