Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac6aded76b61a7e…

MALICIOUS

PDF

76.7 KB Created: 2021-03-16 19:11:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 79af4cfbb675e31007b6c50fc0be4b1c SHA-1: 5133750aba4d7aebd8d36cddfedd8142c2d20bd2 SHA-256: 6ac6aded76b61a7e618a34700a4e8cfe62342cd37b8da1e89f6a047f300fce4e
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 0.9992

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://jacksth.ru/123?utm_term=conversion+of+metric+units+worksheet PDF link annotation
    • http://poposiruta.mywebcommunity.org/kenmore_elite_he3_dryer_heating_element_fuse.pdfIn PDF document text
    • http://trokot-online.xyz/instagram_black_background_androidapl40.pdfIn PDF document text
    • http://dommasters.site/strength_training_program_without_weightshfwg5.pdfIn PDF document text
    • http://kifopelidito.mypressonline.com/romberg_test.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458144/normal_60005bf1a3b7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413110/normal_603af7e8aa4c8.pdfIn PDF document text
    • http://disajawamiwa.iblogger.org/desert_fathers_quotes_on_prayer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527237/normal_601a54ba18803.pdfIn PDF document text
    • http://igcopyrightforhelps.com/acetilcisteina_xarope_infantil_bula4rdr7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370057/normal_601cffe94a182.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408461/normal_6036519d4e7eb.pdfIn PDF document text
    • https://gazisaki.weebly.com/uploads/1/3/4/3/134371182/mapanutivazokesesa.pdfIn PDF document text
    • https://waxebusesu.weebly.com/uploads/1/3/4/7/134770319/9051537.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nokigabexotuk.rf.gd/baldwin_letter_to_my_nephew.pdfIn PDF document text
    • http://wazuvolixevafo.rf.gd/midland_wr300_not_receiving_alerts.pdfIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_971a6ec5009942448e24c6c1c938135d.pdf?index=trueIn PDF document text
    • http://kofepiropi.onlinewebshop.net/low_carbon_steel_chemical_composition.pdfIn PDF document text
    • https://24451074-f53b-4065-993c-779ba3957988.filesusr.com/ugd/0ae25f_494681aa63c440e692cfa97849682b22.pdf?index=trueIn PDF document text
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_5de7d1b28d574810ab60efc73907273e.pdf?index=trueIn PDF document text
    • https://d2ea4bfc-f92a-4379-acf2-d9b69981ddb7.filesusr.com/ugd/739437_2205bf3e78244cff8403d89ff919d0aa.pdf?index=trueIn PDF document text
    • http://misopipe.rf.gd/88991684401.pdfIn PDF document text
    • http://tezibezob.epizy.com/online_movies_for_free_without_membership.pdfIn PDF document text
    • http://zimopup.myartsonline.com/fabaxupu.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_off0000eff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF0 5000 bytes
SHA-256: 3aa44b7480733ee2f940bfb1276c6fd23a025bb4dc808d4af878bd34a737d495
font_01_sfnt_off000100e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E4 10468 bytes
SHA-256: 3c43b9a7e427944ec30849f5dcde2a9f9361ad4d9a4ade756aa543f2790bd95b

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