Malicious PDF — malware analysis report

Static analysis result for SHA-256 efcd4973dee9274c…

MALICIOUS

PDF

115.6 KB Created: 2021-03-15 19:13:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e4316731f820758995b09080feb52d4a SHA-1: 2c562133d2b64f0f535c76d6129dd2eb65aad6d9 SHA-256: efcd4973dee9274c4215a39ae94a0b358f1aeb1faaa577148d4b66a45cf59e16
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, as malicious. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt at SEO poisoning to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to 'water heater timer troubleshooting'. The presence of external URIs and the link farm structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xajibur.ru/wix?keyword=little+gray+box+water+heater+timer+troubleshooting PDF link annotation
    • http://pajugurujuvavux.22web.org/voluvilitefituboxamik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449604/normal_5fe5b86e33c01.pdfIn PDF document text
    • https://cdn.sqhk.co/dutebosatu/RicKq8l/quartz_singing_bowl_benefits.pdfIn PDF document text
    • https://cdn.sqhk.co/rijunawep/gk6giic/pocketinveditor_pro_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370092/normal_604902abd7920.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/dlHhYpy/house_of_fear_predator_scary_horror_escape.pdfIn PDF document text
    • https://cdn.sqhk.co/mowasikuso/9jCFgea/best_characters_warriors_orochi_4.pdfIn PDF document text
    • https://cdn.sqhk.co/pimepojuti/bz4je9w/kamado_tanjiro_no_uta_piano_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/niramojiga/eif1foO/28677775294.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404121/normal_603c1bd7b1b1a.pdfIn PDF document text
    • http://sabukapu.22web.org/83347048504.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bopubinenunoxow.rf.gd/personal_balanced_scorecard_definition.pdfIn PDF document text
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_069538bdd26f4f82977376c36d810651.pdf?index=trueIn PDF document text
    • http://rupojizob.epizy.com/ravoseguduxiveroxoxid.pdfIn PDF document text
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_811310e331954d538ce7f2bc267e72d4.pdf?index=trueIn PDF document text
    • http://titetirif.epizy.com/redundancy_letter_template_ireland.pdfIn PDF document text
    • http://widafasamuj.epizy.com/bidasogilokepowozu.pdfIn PDF document text
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_caa565975816470ab961d889a9f0a85f.pdf?index=trueIn PDF document text
    • http://fupenidiwed.rf.gd/bumibema.pdfIn PDF document text
    • https://a4edf7fa-b057-49b5-8014-e5fd436fbef3.filesusr.com/ugd/c8b2c5_34e93e16edea4fc3ab1772da05b09a0e.pdf?index=trueIn PDF document text
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_675b53f3472749cca4bafaef4791ac50.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_off00018724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18724 5440 bytes
SHA-256: 8f24bac2c45fd726842e8d53e83aa73abe8e47b0b32a7e87a89bfba5b19741ba
font_01_sfnt_off0001999a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1999A 11308 bytes
SHA-256: a5cfca6cd67b1551c57f312e772df3101de4a45aadfdc2a675414056d8316471

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