Malicious PDF — malware analysis report

Static analysis result for SHA-256 08db968756908207…

MALICIOUS

PDF

80.9 KB Created: 2021-04-12 05:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: eb90d57b89bbbcddac7579f279999fa5 SHA-1: d9b17c2f589aaf9da88c981de3f5cdd670f4b79d SHA-256: 08db9687569082075c419b95cf542e80816a3c331442abd65b45044a7a93cf35
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The primary URL, 'https://zajinet.ru/strik?utm_term=what+is+end+behavior+of+a+polynomial+function', suggests a phishing or redirection attempt disguised as a search result. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=what+is+end+behavior+of+a+polynomial+function PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452837/normal_60539596f4139.pdfIn PDF document text
    • http://birjand.design/indonesia_vpn_for_android_apk8i2q5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500878/normal_5fdbbd328ccfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417827/normal_5fd65ac77c0f6.pdfIn PDF document text
    • http://lidomuxadade.22web.org/27258823660.pdfIn PDF document text
    • http://bitcoinov.site/90991113974v932y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366042/normal_6002feccaa85b.pdfIn PDF document text
    • http://form-lnstagramcopyrightservices.com/25474449158f7vwm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492573/normal_6000f06a4df1f.pdfIn PDF document text
    • http://remont-pc.website/dejefisidemarojizovidu8hsaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bezorito/gardening_merit_badge_pamphlet.pdfIn PDF document text
    • http://ledolabufimo.epizy.com/receitas_na_air_fryer.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/recipes_using_crescent_roll_dough_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/598f43df-b2e3-42d1-b759-8b458ba97efb/polebetabapubogafetesedo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2049781-d8a3-4bff-ae03-1579d90b149b/kerosunetanepix.pdfIn PDF document text
    • http://novosumagib.epizy.com/angularjs_5.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/captain_marvel_post_credits.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://scripts.sil.org/OFLIn 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_off0000e676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE676 5708 bytes
SHA-256: 4ac8d8aea4674641cb48e15ee33835045fe05812afa8983e527f84356446cf36
font_01_sfnt_off0000f9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C9 11312 bytes
SHA-256: 73340d448b32fd619e43abb9f82ed0cec6c62840f77b15db575e3191cb6655b4
font_02_sfnt_off0001208e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208E 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

Open this report in the interactive analyzer, or submit your own file for analysis.