Malicious PDF — malware analysis report

Static analysis result for SHA-256 25e6eccc727b12f3…

MALICIOUS

PDF

77.8 KB Created: 2021-03-20 20:15:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 823a3dc9baaff9d5dbdd6e25a584fc9c SHA-1: e2ab9dcbc826900f773e72eaf26ac42c0207b792 SHA-256: 25e6eccc727b12f319e74a04a8fed223e47af1fc50f71151841e29461e2a9ce4
134 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs, many of which point to disposable hosting and are likely part of a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The document body, though heavily obfuscated, suggests a lure related to 'Cctv dvr installation guide pdf'. The presence of embedded URLs and the overall structure point towards a phishing attack aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ponafet.ru/award?keyword=cctv+dvr+installation+guide+pdf PDF link annotation
    • http://idealica-itufficiale.website/xubamojujiupyep.pdfIn PDF document text
    • http://wipababotuzuke.iblogger.org/97384355246.pdfIn PDF document text
    • http://peuly.xyz/kubefawarbytbs.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/YhiDphg/free_wifi_anywhere_you_go_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477615/normal_6032dca34adca.pdfIn PDF document text
    • https://cdn.sqhk.co/wixefawoz/dEhahhf/badminton_league_hack_game.pdfIn PDF document text
    • https://cdn.sqhk.co/senosekagoko/gcJxgdV/44540372216.pdfIn PDF document text
    • http://legionmone.xyz/adverbs_of_place_and_time_worksheetrad86.pdfIn PDF document text
    • https://cdn.sqhk.co/kejaxedusuk/ihAifln/youtube_song_i_don_t_know_about_tomorrow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371800/normal_601884c31b29f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484631/normal_5ff88c70c4fdd.pdfIn PDF document text
    • http://talemine.getenjoyment.net/rosemiferas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411512/normal_6042de95b3352.pdfIn PDF document text
    • http://niwadeg.mywebcommunity.org/angelica_liddell.pdfIn PDF document text
    • https://cdn.sqhk.co/logulemuset/cji9lDW/42936372546.pdfIn PDF document text
    • http://mjawebdesign.net/zakezexiwoditup31vh8.pdfIn PDF document text
    • http://laludinemolat.sportsontheweb.net/37986583205.pdfIn PDF document text
    • http://keep-travel.com/samsung_vrt_plus_washing_machine_ur_code62mcl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375518/normal_605585a5bb72b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tobaziw/vietjet_cabin_crew_application_form.pdfIn PDF document text
    • http://lekipidupi.rf.gd/89191714731.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/management_of_dyspepsia_nice_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/boduxakegebogopigagow.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/bartok_romanian_folk_dances_piano_sheet_music.pdfIn PDF document text
    • http://faxajipemafeb.epizy.com/voxotuximetinifetosudi.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/catalyst_9300_hardware_installation_guide.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_off0000f2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DD 5288 bytes
SHA-256: 7ba3f471d8ae74603f677b550566262fd64a0169d2ea10530d4afe34d4537239
font_01_sfnt_off000104f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F0 10652 bytes
SHA-256: 6627b945221ff68c8af62753016610a1295f8656f8335d2afdbae418d301d7fa