Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cc7fbf24eb825da…

MALICIOUS

PDF

78.0 KB Created: 2021-04-26 16:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 383c15f9ff45faba6f462c088955cdee SHA-1: 22efd17395d40f3d99c7eabd5c75405f7380edf5 SHA-256: 9cc7fbf24eb825dacd49e9d47be64c09d81907c2d0c228c1c2e694973a7bffa0
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both ML classification and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content or phishing sites. The primary URL identified is https://mezovuduw.ru/strik, which is likely part of the malicious redirection chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://mezovuduw.ru/strik?utm_term=does+a+polaroid+one+step+need+batteries PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366304/normal_5ffe428d37c8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466368/normal_5fe6fb699bcee.pdfIn PDF document text
    • http://shtampshop.ru/how_to_study_physics_for_neet_2020ymvls.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446497/normal_5fd66349ac366.pdfIn PDF document text
    • http://item-mask.top/9131242670350dmr.pdfIn PDF document text
    • http://ital-girl.space/29723375890g2o8s.pdfIn PDF document text
    • http://promooffer.site/nixapoxidunowasafosevaxat3n1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424696/normal_6069863f97e16.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/biwuwukesazef/ankylosing_spondylitis_guidelines_acr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e1e4545-5214-4cad-844a-4d017b5b2ffe/15956208189.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23b49302-fb4a-4cd2-808c-4a0e312fbade/50307639955.pdfIn PDF document text
    • https://8b7199fc-a029-4910-8138-caee300d1cbd.filesusr.com/ugd/da8f68_91ac31ca7dce452496ef39e9510d3b8d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/370d3803-cc71-4a2f-99b3-e384ee2a1e37/sharp_aquos_tv_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/jumanowavokososudo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90493d5d-b432-483d-b3a9-e177044d966e/duvovezaragadopibez.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/broadband_forum_tr-_069.pdfIn PDF document text
    • https://efe523a3-d756-4f55-ba91-412f3a718e00.filesusr.com/ugd/236571_b03ce376e27f414298204a2a98c8cc10.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gedexim/fafim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/787cb814-ea97-480e-bc5e-adcc5996dee6/what_are_the_two_common_types_of_errors_in_human_judgment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ad54c38-8904-4a96-ba90-8b11499585b1/what_is_realistic_drama.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_off0000f34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34E 5092 bytes
SHA-256: bab8912d10dd4250bc71278328d2919364ffca26e6f36bd6199db131219d0a7e
font_01_sfnt_off000104a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A7 10576 bytes
SHA-256: e18c1e05ba1ef287df403a412eb69dd48d0b15f73e339e9bb2c9aa5163f89532