Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2572f7a9575f8ca…

MALICIOUS

PDF

86.2 KB Created: 2021-03-08 14:46:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: e51d65b73155dd65291ff762f4ed3653 SHA-1: 2a8eb1401c052bd74aca5d2ebe10edfb271ea1f1 SHA-256: c2572f7a9575f8ca299ff7ada449cd8b1e1eb43f3ffa28306fad2f8b5d592e2c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for link farms designed to redirect users to malicious content. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an intent to lead users to potentially harmful sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/wix?keyword=sardar+best+jokes PDF link annotation
    • http://srakan.space/928988999868t6m0.pdfIn PDF document text
    • http://tepoparupomo.medianewsonline.com/10341865046.pdfIn PDF document text
    • http://soldatskaya6.ru/xosimn8rch.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418566/normal_5fc9e0e262be1.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/how_to_install_a_new_lawn_mower_battery.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481402/normal_5ff1e6b1a5028.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387929/normal_603456f64730f.pdfIn PDF document text
    • http://milansit.space/super_granny_pc_game_freeirq6v.pdfIn PDF document text
    • http://classicalnaturally.com/91200731839seksc.pdfIn PDF document text
    • http://best-ital.fun/sentiment_analysis_and_ontology_engineeringn6a7o.pdfIn PDF document text
    • http://chambrehub.xyz/advice_seeking_letter_formatyvvuo.pdfIn PDF document text
    • http://pshcomonhere.xyz/roadside_picnic_english_translation1zl0g.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/which_processor_is_best_in_i5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464874/normal_5fee481cc6bb6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488572/normal_5ff9a5b7405ef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_2f5eab3eeb0747c199c657da99cffa51.pdf?index=trueIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_6975db57945c40439457aa549cd58ddc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/465cfc78-e64e-422d-a667-587605df67d6/15537161973.pdfIn PDF document text
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_42e0113978d14688a5023982da2ddc42.pdf?index=trueIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_1abab83ffc5c4e898e74d9623c32685f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b985a5f-e24c-481a-b6a2-522de163b0f4/the_argonauts_are_named_after.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_off00011753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11753 5168 bytes
SHA-256: d9c5f375bf95523ac0c6eb1b37771bd29b4b1db976f645fa22932f3d0cb43582
font_01_sfnt_off000128f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F5 10252 bytes
SHA-256: cc6351b2b73a2fa2add8fafeafdae788fb078872cf124767eb8a35889a1dfa59

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