Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef73e83db6b7ced6…

MALICIOUS

PDF

85.6 KB Created: 2021-04-08 14:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 62c110f6a7df453514786afad635fb29 SHA-1: 2ec3f7c6240a43e57d766f521963ab96d025b27b SHA-256: ef73e83db6b7ced6e64aa868562c0a03375c74c3c89f2696ab5270c2697e6659
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jottigo.ru/strik?utm_term=prohibido+enamorarse+de+adam+walker+epub+gratis PDF link annotation
    • http://idealicacolumbia.site/625764852521od9g.pdfIn PDF document text
    • http://nujagexurej.medianewsonline.com/67607815807.pdfIn PDF document text
    • http://waliduv.mypressonline.com/aptitude_test_mcq.pdfIn PDF document text
    • https://ronunafo.weebly.com/uploads/1/3/1/8/131856498/towotonejowogomuv.pdfIn PDF document text
    • http://e-sparks.ru/all_souls_book_chapter_2_summarywj84b.pdfIn PDF document text
    • https://cdn.sqhk.co/wefegiwezon/aUBzgeg/ayasa_the_reason_why_piano_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/sepokafaru/if88GUR/occupational_health_services_portsmouth_nh.pdfIn PDF document text
    • http://vigastlens.xyz/vimapujo4or.pdfIn PDF document text
    • https://nijeliwawinezim.weebly.com/uploads/1/3/4/4/134497061/wekeromuvinatiloz.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/qjdjajf/refuzeda.pdfIn PDF document text
    • http://gaydating.world/85062814794a2j6q.pdfIn PDF document text
    • http://fuwijumazawad.mywebcommunity.org/number_theory_definition.pdfIn PDF document text
    • https://pinuzika.weebly.com/uploads/1/3/4/6/134640149/sinugunew-resejedini-zalawulupibuwo.pdfIn PDF document text
    • https://cdn.sqhk.co/tefegegesuxe/Hr3ieih/ski_safari_1._5._4_mod_apk.pdfIn PDF document text
    • https://bifekanivixu.weebly.com/uploads/1/3/1/4/131408854/9434462.pdfIn PDF document text
    • https://cdn.sqhk.co/navozaxezini/icgdP7A/23971204972.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/60ce3b53-7469-4e21-b95b-b32ca7e45a97/bidigosubik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b84f86c-390a-4afd-9b1a-bc60aef5cb1c/56989696701.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bd8513a-bcf5-4321-91b0-07e44b6dcc6d/xepowabi.pdfIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_012628a4d91f41f38f073471fba65afe.pdf?index=trueIn PDF document text
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_90f9f1f941a34cfd94944f145c2c18ab.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/407dc0a9-17c7-4848-96d9-5c60b57e0a9f/all_things_are_possible_with_god_verse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa2cf7a6-9330-4482-addc-74834383564d/44710421543.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11171 5672 bytes
SHA-256: 6110d9b4c6413ffe6f75f34cc69eda32459e295a76de7a7351bb252d3cee3f77
font_01_sfnt_off00012495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12495 10552 bytes
SHA-256: a375dc2af365997a593deef733a6a3e084dbd3bde333609ee6a4b6043c741505