Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf85f97d3b4246f…

MALICIOUS

PDF

83.2 KB Created: 2021-09-10 11:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4fe625494957454b0202e621e564a485 SHA-1: 16146b5ac3142c81ff75fb2b397b928cbad0d5f1 SHA-256: abf85f97d3b4246ffaa01c7620d8b3af7e3a4d7fafd93671fcc7bad403492d6f
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document containing embedded JavaScript and numerous external links, many of which point to other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a visual download button lure further supports a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://positiveforce.in/uploads/files/14255863611.pdf In PDF document text
    • http://autosoftware.company/autoresponders_images/files/dofosawuwufamalu.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/19027806222.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/66612956666.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021090815191138.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/81427203166.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/manidowo.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/powogeturut.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/96803812372.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/68031060076.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/mefiwus.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/bc9edc13f4e2520c480c9a460b3138a7/2535538037.pdfIn PDF document text
    • http://martonelektro.hu/files/file/mobixira.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/kazejasakiz.pdfIn PDF document text
    • https://uudanbury.life/files/file/dunajatu.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/6786280335.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/jevejufixosetizenuxizulo.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139cd01368b1---menoxinaxunedakaxemu.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/70786556818.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/lugedupofa.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/75220267837.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/86971080402.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/satimizeji.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/jewisalusojamukejafexuxon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=supreme+duelist+stickman+mod+menuPDF 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_off0000de0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0B 18064 bytes
SHA-256: 1bbd48fadc7a54396b53601673fdbc2f529e478c4dab20f04aec4b0ebc94bb17
font_01_sfnt_off00010d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D67 10944 bytes
SHA-256: 50c148c4a188d964931653bcfd7d46a0501d85a5a6d454026fb502ee023f0f24
font_02_sfnt_off000126bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1