Malicious PDF — malware analysis report

Static analysis result for SHA-256 eba76d8314420388…

MALICIOUS

PDF

74.5 KB Created: 2021-09-16 13:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c9505fa74e5f47150f31bb109025dfbd SHA-1: a487194c0166077657c8b8b412ee69eaf658952a SHA-256: eba76d831442038854a8adc5153fdefef85388bc34c3f991024a3175033b2977
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. The embedded URLs, such as https://infrive.ru/uplcv?utm_term=how+to+find+equation+of+quadratic+function+with+two+points, likely serve as the initial lure or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://infrive.ru/uplcv?utm_term=how+to+find+equation+of+quadratic+function+with+two+points PDF link annotation
    • https://eurouniversal.eu/ckfinder/userfiles/files/xuzigokololunowonigepen.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/25178285838.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b70f34a772---19023855327.pdfIn PDF document text
    • https://tivicom.vn/upload/files/36825829239.pdfIn PDF document text
    • http://unseretochter.com/images/file/dulelupuxinamufinelofax.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/98429863284.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16134aebae81ff---17469305286.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/gegiluvowitomukugalo.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/wemipofufenunigubojex.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/88998735382.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/94741380045.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/fomabelodagatatewuxuta.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/60214013652.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/6038425276.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/nufuvomerab.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210910101428.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/12415215815.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/42923007187.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/40864410658.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/rusikitajexegesi.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/10031734588.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_off0000bfb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB7 16688 bytes
SHA-256: cccb4311b88739976a37dfb387d6312d0ec9b25ab6cb67646421c58de2964835
font_01_sfnt_off0000eab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB2 10992 bytes
SHA-256: 0c22402d88551449b475de61fbe40cc2b0a3e723ae37d14f7c560701308233e6
font_02_sfnt_off000103fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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