Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ffcb4298c9d40e…

MALICIOUS

PDF

86.1 KB Created: 2021-03-22 22:19:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 953c198f01f329bb8d75ace4a5d30571 SHA-1: 21504dfe68cce0eb43a5e37d20c2bbd3fc986b30 SHA-256: 16ffcb4298c9d40e1ce077c0a4e31cf43821f56c75057b94acd8d06ef1fbdccf
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 0.9993

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://resalured.ru/award?keyword=trastorno+de+ansiedad+por+separacion+en+adultos+pdf PDF link annotation
    • http://govnosiakxws.online/stihl_bg86c_leaf_blower_spark_plugtzpb4.pdfIn PDF document text
    • http://brandframeb.com/7242441688917v3n.pdfIn PDF document text
    • http://optarfes.com/gikakomga4h.pdfIn PDF document text
    • http://liketime.online/fepozelinajagojeccyx3.pdfIn PDF document text
    • http://lnstagramverificationbadge.com/the_blind_assassin_margaret_atwood_sparknotesw48vl.pdfIn PDF document text
    • http://sodahq.club/casio_fx-991es_plus_scientific_calculator_appgrol9.pdfIn PDF document text
    • http://frontend-developer-azaynullin.site/spider_playing_cards_gameygj6x.pdfIn PDF document text
    • http://xekumaluvox.iblogger.org/nuzolurenapuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://losopokatefoxot.rf.gd/37400041551.pdfIn PDF document text
    • http://lepevalir.rf.gd/bumigapugawewizipiduve.pdfIn PDF document text
    • https://235be7ff-9b22-41de-91df-7a9e5ced5199.filesusr.com/ugd/4fa465_ed8aa53582db44bfa03b2a455e531e48.pdf?index=trueIn PDF document text
    • https://6f0a1f77-3195-4c90-aae7-8e5805bb56bd.filesusr.com/ugd/f94fd0_72f89cbfd8fc44bbbf14eabf8929c4cc.pdf?index=trueIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_f76dea23aa004108b2d987e41261aa02.pdf?index=trueIn PDF document text
    • http://vipagepegavazus.epizy.com/burizojibux.pdfIn PDF document text
    • http://tikolikenugim.epizy.com/fivinalekulowofunura.pdfIn PDF document text
    • https://0a497e50-07dd-462d-832d-d8678f741a8e.filesusr.com/ugd/5f857b_acf6fe51f9c4436fae88910561499833.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/suzujewa/99412642678.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/outlook_365_office.pdfIn PDF document text
    • https://bf808793-8b46-4c54-8b11-319763181fa0.filesusr.com/ugd/0d018b_08fd701e5d77495685d9ff7803e17cdc.pdf?index=trueIn PDF document text
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_753dba69eb4c428cb83c43992f1764f3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pujirageg/89829106435.pdfIn PDF document text
    • https://6d428a25-da86-44fa-8f13-5b0f09742281.filesusr.com/ugd/3649d2_2a3d0d4660e344518a07d1f1a5ce772e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xapota/cursos_de_ingles_en_orlando.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/ipcc_fifth_assessment_report_concludes.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_off00011232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11232 5100 bytes
SHA-256: 2fe8e25d75fbb31d7ac9e258a82db288a1644bddeefe8f5f95708955f9883161
font_01_sfnt_off00012396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12396 11536 bytes
SHA-256: 393a213cd42b181e67bbd3678f6257eda7acf6a9d9bc92bd2e108d66fba0601a

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