Malicious PDF — malware analysis report

Static analysis result for SHA-256 19ef958e961bc373…

MALICIOUS

PDF

79.5 KB Created: 2021-09-18 07:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 79e9f53328c85ebcc31f027a13f5f9f0 SHA-1: 77071b90cee4a8979fbe79c4d7dc69b55284dd62 SHA-256: 19ef958e961bc37346c0c1eee09b04be9bb175648eb1b2dfab39991ed3ac1484
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm, likely to distribute malicious content or phish users. The embedded JavaScript suggests an attempt to execute code, potentially to download further payloads or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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.
  • 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://pistant.ru/uplcv?utm_term=vpn+without+play+store PDF link annotation
    • https://alstar.uz/images/shared/file/66378632854.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/bezalolutotepaji.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/kitonebalorofeg.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138197a40a89---gokosasenezitenuxilut.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/90553068687.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614265c90f568---vasukuwaseke.pdfIn PDF document text
    • http://superazs.ru/images/news/file/juwivisadamumimuf.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/4410549932.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/lukowup.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/7635990695.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/8499236239.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/15157336580.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/47080454835.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/88168501498.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/72381291634.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/51473764800.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/getopejukitaketozopok.pdfIn PDF document text
    • http://8njl.com/userfiles/files/jafejemosem.pdfIn PDF document text
    • https://dm288.rs/slicice/file/deriro.pdfIn PDF document text
    • http://yanartextil.com/firma/files/78584337981.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/wobetuwosorizobodudi.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_off0000d3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A7 10616 bytes
SHA-256: 0f7d1f00012b3e660df2bfabc393affde24f045d90c3eadca3daba5df0df351f
font_01_sfnt_off0000ebfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10410 17136 bytes
SHA-256: 7a4cdde60ee91b42352d4a81048ee6e9d8428a92bbfa6e916c15dc8f3d11bcc0

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