Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9ec1b080694485…

MALICIOUS

PDF

68.2 KB Created: 2021-09-30 17:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d7a4cd8270a7225f5d378ce316d202c8 SHA-1: 740113c1bcd5462bc21bc203a7703ff36d01dd5a SHA-256: 7f9ec1b080694485914006e37490d800f39d02ee004af9851a1484e5cabfa96f
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and the presence of an external URI. The document body is heavily obfuscated, but the heuristics indicate it's designed to trick users into clicking a link, likely for malicious purposes. The ML classifier and ClamAV detection strongly support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://smidgel.ru/uplcv?utm_term=new+york+full+movie PDF link annotation
    • http://cbestdesign.com/ckfinder/images_store/files/97976020633.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/67351319135.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5a64156a1---kosikusuwiripawad.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/wumojivube.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/gewikojuvesadewesex.pdfIn PDF document text
    • http://futiandj.ntgis.com/UploadFile/2021/09/25/file/20210925_110235_182.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109041505293359.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/titolerogikigix.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/vusuz.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/7791nhajhvonaq9vac6ifrcru0/mumopobikusinufinizeji.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/9274432788.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/93270049892.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/2076758643.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/naxuvirexofe.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/madexinebapelesiluvezabad.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/32402804293.pdfIn PDF document text
    • http://cheapstandard.com/uploads/files/xumadivufel.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/ratimutub.pdfIn PDF document text
    • http://katachizu.com/img/news/files/zekixinukizasetozofiboba.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/60568647595.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/dexowufabemuz.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/diteweduvo.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/mekinikazedilore.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB12F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC941 14024 bytes
SHA-256: 5dbdcf36a21583ef0c44a2e4c34ec737332c650eaa1d9e71974945a10fe2760a
font_02_sfnt_off0000ec0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0F 10276 bytes
SHA-256: b8a1e2d351cf97c02c3dc417fe39c42a2f5dfc49cfbf7e70a21516545d42f715