Malicious PDF — malware analysis report

Static analysis result for SHA-256 c09f009673c9749c…

MALICIOUS

PDF

75.5 KB Created: 2021-04-24 23:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5105ca345e504819de1b4ee4c6064aa6 SHA-1: bac875b9ca54bd5cba71afd2c348017b7bfaa249 SHA-256: c09f009673c9749cfe3d69a088906d41fd727ed8198199bb370faf045d81fcba
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the presence of numerous external URLs points towards a potential download or redirection mechanism, possibly involving JavaScript within the PDF.

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://zajinet.ru/strik?utm_term=reinventing+your+life PDF link annotation
    • https://mubasaji.weebly.com/uploads/1/3/4/8/134846322/bikofafa_datatapug_duzopawelan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_60534e9ba9fe2.pdfIn PDF document text
    • https://wivixovipi.weebly.com/uploads/1/3/4/4/134442696/8311490.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385852/normal_5fdd30de7b459.pdfIn PDF document text
    • http://o-karte-kopilka.com/android_platform_tools_folderp7bgo.pdfIn PDF document text
    • https://wipevotabekux.weebly.com/uploads/1/3/1/6/131607119/5573386.pdfIn PDF document text
    • https://luwagibefex.weebly.com/uploads/1/3/5/9/135966535/zusezuvalaf.pdfIn PDF document text
    • http://presalon.xyz/gagonigobakiq58x1.pdfIn PDF document text
    • http://filuniguwol.22web.org/algebra_1_chapter_6_review_answer_key.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sobojagi.epizy.com/nothing_else_matters_guitar_tab_easy.pdfIn PDF document text
    • https://9c50f6df-e9c1-453e-a208-eff1cefe231f.filesusr.com/ugd/44b3dc_8da40ad21f394ab68b5d56560e3cc64b.pdf?index=trueIn PDF document text
    • https://d670dda7-df53-4ef1-8eda-d3256df28744.filesusr.com/ugd/dbbbec_6987253113fd4e9fa19ea6e5bb9e7a2a.pdf?index=trueIn PDF document text
    • https://45884d5c-3037-4093-99f9-9b9c28a1e9f0.filesusr.com/ugd/3721b1_555bbfeac01c410a804f405df9b008c8.pdf?index=trueIn PDF document text
    • http://tibupud.epizy.com/la_ciudad_latinoamericana_alan_gilbert.pdfIn PDF document text
    • https://aca56392-15ae-48e8-982c-fdf6c4ac0dc3.filesusr.com/ugd/00c070_27706c36f3074283a5cfc87c819b107e.pdf?index=trueIn PDF document text
    • https://b6d28218-96ba-4f98-b9c1-0d78b4e6fe84.filesusr.com/ugd/47aa88_be3147cc96504bc4bc0274f9008ada17.pdf?index=trueIn PDF document text
    • https://17c3d818-7f64-4152-976a-2fa997d7a7be.filesusr.com/ugd/e2c250_62a243fa37094403aaa54ed515d614f8.pdf?index=trueIn PDF document text
    • https://6ba8113a-99dc-4618-97bf-d7180f10ff72.filesusr.com/ugd/b6edda_10ce78ea0f154026b2d712bcb8c296b3.pdf?index=trueIn PDF document text
    • https://77cbb24c-feae-490b-854c-0a9d4db21a85.filesusr.com/ugd/3752ea_0d6b883f4101415a8034e1afe162c04b.pdf?index=trueIn PDF document text
    • http://vamuxusonepuf.rf.gd/lomulenikupovirubof.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_off0000eaba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABA 4716 bytes
SHA-256: 1421fca8524386682dd37415ce9e4e509c60db9bf46c1cd212cbcab3cb1b5d01
font_01_sfnt_off0000faee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEE 11480 bytes
SHA-256: 2258f0206784eb4162676e76ea625e8668a1caa4b8c630b8de90aabdcd6dcad4