Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c668af15dff3e8…

MALICIOUS

PDF

157.4 KB Created: 2021-05-18 20:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 587de49a03f5be589051326e179c8749 SHA-1: 530a91b18ce3fefe42e1ba7fdb83252845d2727a SHA-256: 11c668af15dff3e8b40b34dfdc6b36dfa36554a9bfb29b639902bdd4f7f63e7e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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://vilenefex.ru/strik?utm_term=diccionario+teol%25C3%25B3gico+del+nuevo+testamento+volumen+5+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449399/normal_602621b98d0a3.pdfIn PDF document text
    • https://nijuvijoz.weebly.com/uploads/1/3/1/4/131408832/mapumemadifonaj_nidapid.pdfIn PDF document text
    • http://fudasoba.iblogger.org/wusemaxabaxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367911/normal_606395b80d607.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449771/normal_605fba794b2d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447631/normal_5ff4d44925286.pdfIn PDF document text
    • https://tuxativavowaz.weebly.com/uploads/1/3/1/4/131437956/7885673.pdfIn PDF document text
    • https://wujawosekeg.weebly.com/uploads/1/3/4/7/134712458/tobudasupapu-fulubutezakajet-xetiserebo.pdfIn PDF document text
    • https://bovozamebezunun.weebly.com/uploads/1/3/4/7/134701649/nukujetamavok.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/517e824d-aac0-40a7-8fe1-fdd5ec31bb7e/40601723088.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e88ed91c-2516-4da5-8a47-9a63b93cee16/5716702839.pdfIn PDF document text
    • http://norejuwalabufa.rf.gd/39329912971.pdfIn PDF document text
    • http://vixezazemezox.epizy.com/basic_concepts_of_computer_hardware.pdfIn PDF document text
    • http://rufodax.rf.gd/krav_maga_techniques_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f0b12f7-5ece-46ce-9e14-749c47d91faf/57288504821.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f270e100-48ed-45be-9ec8-44cc64b947a4/pudotugisulobebisivi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59692b8f-878b-4f48-aae5-dc65be12d77b/fesateboxebeku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6325d09e-cee9-4f73-9d20-3a89c39fc729/alpine_x305s_bluetooth_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0473fa5f-d2da-492c-a035-2b901d4f8a78/6237299026.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c80aaacb-7022-4abe-b7ee-8a734ca580c7/tivepifiludunagalelujutow.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_off00022546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22546 5792 bytes
SHA-256: 48760c43bcf42f32c746ea75fcf4f6b69bae981b2e0677b79cd4c9bda5422a32
font_01_sfnt_off000238bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x238BB 13752 bytes
SHA-256: f28d0259d6c797abc999f0f665bcfba966b7e799329ef3f9e7786fd76679e2a9

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