Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79057fc3d404c09…

MALICIOUS

PDF

76.7 KB Created: 2021-02-19 00:00:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9758fc3a11a2dcf07a0383cc69df59ec SHA-1: 6af5bb2d12acb170df3546a4c481c34585c60231 SHA-256: c79057fc3d404c094c3becb3bbf1294523e7650a80942abd2f2a859b273d5a1f
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains a title related to paper airplanes, suggesting a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/strik?utm_term=how+to+make+a+simple+paper+airplane+that+flies+far PDF link annotation
    • http://sfhgfje5df.xyz/xafipubotalaxalvaao.pdfIn PDF document text
    • http://mif-smeh.space/plantillas_de_cajas_de_navidad_paraivyg6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370560/normal_60031b5f50f9d.pdfIn PDF document text
    • https://cdn.sqhk.co/pajokiman/a9cb8hh/children_s_single_bed_sheets.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/RQtihhg/musinigamosevid.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/gJgjhco/decimation_realistic_zombie_apocalypse_modpack_server.pdfIn PDF document text
    • https://cdn.sqhk.co/kurafuso/eiaijij/60143140258.pdfIn PDF document text
    • http://moresukko.ru/wizaguvigerewim5mr3z.pdfIn PDF document text
    • http://vikubemaba.22web.org/advantages_and_disadvantages_of_solar_energy.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/hdshfie/wemaju.pdfIn PDF document text
    • https://cdn.sqhk.co/posebozej/2nxrjdN/bandicam_free_download_filehippo.pdfIn PDF document text
    • https://cdn.sqhk.co/zumufapofow/Qjayxhb/7856634163.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458390/normal_5feef0234bd09.pdfIn PDF document text
    • http://copyrighytsupport.com/xigotejox7jj6m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/febopa/mexomodixunetovatufodafor.pdfIn PDF document text
    • http://putiremupupunis.epizy.com/safe_electric_test_record_sheet.pdfIn PDF document text
    • http://digifasofow.rf.gd/lavizapurazarowud.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/27913321729.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/momotaro_story.pdfIn PDF document text
    • http://jetubomubiko.epizy.com/mutus.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_off0000f064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF064 5260 bytes
SHA-256: c26c14864029fcbaf239b7e33c26948184149c8997bf836eb6b45e7f2bcc9514
font_01_sfnt_off00010227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10227 10248 bytes
SHA-256: d2d6eb8a93d313aad03e2595c745113f340401935edbc54d5a65141ae7c5cb08

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