Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae892e68c5c70ddc…

MALICIOUS

PDF

74.3 KB Created: 2021-09-16 22:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6590cc9f606a134d47802b0c10a72bbb SHA-1: 57733376d5efdd100abb80d1650c02cb6c06834e SHA-256: ae892e68c5c70ddc5488b5a7183dab8ae4bd9a801f2f7d68504292ef4ae44cca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://win-sonic.com/ck_imgs/files/jolujulesi.pdf In PDF document text
    • http://langeline.com/ckeditor/upload/files/wisakasigupu.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/tewuvubonose.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/wejovusupulexazuxotapa.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/gemimifolusuzubupuv.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/nebusozimarajudasukem.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/75940114731.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/69588737308.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/dijupiroseg.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/65649382263.pdfIn PDF document text
    • http://findusafranchise.com/files/files/pofowubad.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210910_002447.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/xanaxulutedenebidodi.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/jemuwe.pdfIn PDF document text
    • http://balone.net/_upload/file///libalolebime.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/81622671073.pdfIn PDF document text
    • https://gadapavimenti.com/GadaFiles/file/wonotoxe.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/jimowofazidamejulefapakok.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/siluxapupibosapevumigu.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/semadowafigefidawixud.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/nevujerozazod.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-4/20210904210417582542.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/43121974674.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/wigopupawatujoxilef.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/fixovitub.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/84099812006.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/lenipomakejimonozigi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=too+big+to+fail+putlockerPDF link annotation
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE1C 17244 bytes
SHA-256: 62cfaa7d44ea668ebe01419f6102bad32cbd503f980797b91dfdc5e317820d5f
font_01_sfnt_off0000ea74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA74 10676 bytes
SHA-256: 9d5d9a85539eae7017664741836f1e6534cbd793164d2aa055037af5378dde17
font_02_sfnt_off000102e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1