Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc5a0209c263b09…

MALICIOUS

PDF

79.8 KB Created: 2021-10-07 14:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 895b18f850e0a4cd463d9c82c73cbaee SHA-1: 42c4e99e09cc7c9360781218687f4cc43b872d43 SHA-256: 8dc5a0209c263b09149e1737ad957c2e522bde83dd66ac28f5a5b406f533a70d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs pointing to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a second-stage payload. The sample's structure and numerous links are consistent with a link farm used to obscure the ultimate destination or to host multiple lures.

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.
  • 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://medvor.ru/uplcv?utm_term=storm+sewer+easements+on+private+property PDF link annotation
    • https://bnovum.hu/downloads/madubazekiwo.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1630643529.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/78072888623.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/679261172614c5850b9083.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/eb4faab6c66a00e932944e5eaa3b3ab3/85843145781.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/roxevomegedesezadadutis.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/ximoxiziviwezizelegalidaw.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021092216021784.pdfIn PDF document text
    • https://dcimx.com/files/fenerojufurami.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/93565803160.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/74597228067.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/53704164761.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/vokixid.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140385395101---monobatemidafuno.pdfIn PDF document text
    • https://codefon2.solar-napkollektor.hu/js/ckfinder/userfiles/files/44495757685.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/77259137656.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/49771923155.pdfIn PDF document text
    • http://geose.ru/userfiles/file/kesiwi.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109121625139299.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/nemapepujowunajok.pdfIn PDF document text
    • http://packamate.com/userfiles/zomepala.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-10/file/2021100411180573499.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/44216718731.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_off0000d349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD349 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5B 17448 bytes
SHA-256: e5eff22545f6ca3f08e9cbd51ccf95130ff8e7bf0feac4f5042c5c33048e71fc
font_02_sfnt_off00011904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11904 10708 bytes
SHA-256: 899db0f6495761939ef393e8fc65771809687f659db358e415cc83516c095f45

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