Malicious PDF — malware analysis report

Static analysis result for SHA-256 df5a543a95da36c0…

MALICIOUS

PDF

68.6 KB Created: 2021-03-14 13:16:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 83d11559891ad9d03fefb1c19cd963f3 SHA-1: 9d82b98ce1c3bf31581ee63f5278c073de8b9491 SHA-256: df5a543a95da36c06ff31d71e34e3c3815f1ca1ff7b1ad1f478c22ecd09211f9
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 0.9998

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://jumiwimov.ru/wix?keyword=hunter+niteglo+humidifier+manual PDF link annotation
    • http://tofogabe.iblogger.org/the_bourne_ultimatum_free.pdfIn PDF document text
    • http://fajujefa.getenjoyment.net/siletutumenixovetajigot.pdfIn PDF document text
    • https://pisekubil.weebly.com/uploads/1/3/4/3/134322001/6917a67f.pdfIn PDF document text
    • http://salet.store/wefedobevobomafyonmw.pdfIn PDF document text
    • http://dommasters.site/geographic_information_system_ebookkfc9l.pdfIn PDF document text
    • http://gixodugesu.medianewsonline.com/20934711836.pdfIn PDF document text
    • http://gaxesujite.medianewsonline.com/plate_tectonics_crossword_puzzle_answer_key_1-17.pdfIn PDF document text
    • http://lebepufu.mypressonline.com/18628510918.pdfIn PDF document text
    • http://artdebug.site/63262400181dotyy.pdfIn PDF document text
    • http://nigoguno.scienceontheweb.net/51744008111.pdfIn PDF document text
    • http://haifaiv.ru/93563581674btyj0.pdfIn PDF document text
    • https://faneboluti.weebly.com/uploads/1/3/4/4/134464249/3288ef736.pdfIn PDF document text
    • http://nedivebepize.iblogger.org/dedunusizazugejoxojerop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nolumer.rf.gd/samsung_sm-t580_not_charging.pdfIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_6c6cf6c8114240069ddbf27319dde06a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/wiwunisepuz.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/ncr_aloha_pos_manual.pdfIn PDF document text
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_f5fd97c4595849a3b876cddcb76ca75c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvazi/lingey_house_ofsted_report.pdfIn PDF document text
    • https://6ce95562-7558-49ee-a7b0-b3003db3b0e9.filesusr.com/ugd/d13e1f_6018383e27334aaea3563ac95cf7d3d1.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_off0000cecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECD 5104 bytes
SHA-256: be74cbf882c0bd30aeeacca41883d68de3d840902ab4bbeb5d4ac31bcfcf9e42
font_01_sfnt_off0000dffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFB 11008 bytes
SHA-256: 1ebe8a8ee2d840521bc00ba0355eb1a048ada0baffb0a388db285d0e0da0c7ca

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