Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d7cff446b44116…

MALICIOUS

PDF

77.3 KB Created: 2021-04-13 08:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a8b64999e15c74e90608ba9cb7671a7d SHA-1: 1f1b1439daa6a8a82422c454b994473df423f5e4 SHA-256: c4d7cff446b44116ad2b67e9921ad1aea67dba54020efeab2d96ce27808620c4
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 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=grohe+kitchen+faucets+repair PDF link annotation
    • http://veviwumifuvemuz.mypressonline.com/enviar_itinerario_en_amadeus.pdfIn PDF document text
    • https://fufuwotasivixi.weebly.com/uploads/1/3/5/9/135966690/tuditujoja.pdfIn PDF document text
    • https://rurajutudap.weebly.com/uploads/1/3/1/4/131437622/f5ec88ba.pdfIn PDF document text
    • http://fewutame.getenjoyment.net/romeo_and_juliet_act_2_worksheet.pdfIn PDF document text
    • http://lizowaw.scienceontheweb.net/insurance_brokerage_business_plan.pdfIn PDF document text
    • https://betutoza.weebly.com/uploads/1/3/4/8/134899773/fasumuzawoti_limadilobo_vebov.pdfIn PDF document text
    • http://br1.red/this_modern_love_ukulele_chordsixbwv.pdfIn PDF document text
    • http://lawyer-consult.ru/is_the_thomas_crown_affair_based_on_a_true_storym0l8o.pdfIn PDF document text
    • https://fabezetenonuke.weebly.com/uploads/1/3/4/8/134846610/kikodosolov-sonudazerutu-xomagigomi-fitivin.pdfIn PDF document text
    • http://jabilevij.mypressonline.com/pneumonia_signs_and_symptoms.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_7b0299eec58a451eb7805ae6c2fb0488.pdf?index=trueIn PDF document text
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_4201ed94edfd4d908cd47ee076fc5efe.pdf?index=trueIn PDF document text
    • http://loxupobupibim.atwebpages.com/zirumadojemu.pdfIn PDF document text
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_99e7f3be77e84e938e4aa7314ba0ee13.pdf?index=trueIn PDF document text
    • http://gevapugono.atwebpages.com/31957039272.pdfIn PDF document text
    • http://jetotajasavesi.atwebpages.com/minimalismo_libro_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/denesanikaxekun.pdfIn PDF document text
    • http://rixigor.onlinewebshop.net/benign_positional_vertigo_patient_handout.pdfIn PDF document text
    • https://f84ffea9-2755-49c2-9cb5-47ca8b55fe65.filesusr.com/ugd/0adedf_5343e5f699694e03ba3bb6912e818157.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/setikizo/kasuv.pdfIn PDF document text
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_d58ba1976305480b972aa1009501224c.pdf?index=trueIn 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_off0000f332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF332 5168 bytes
SHA-256: 7fa14fe5fde5a7129e9fbea5181e990fb1edcf929f23f29f4e3000376c23fd4d
font_01_sfnt_off000104c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C8 10332 bytes
SHA-256: 1742202e3681873064f47c7862469ccb4fc2146b865d4f09989c1064ee7ecce9

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