Malicious PDF — malware analysis report

Static analysis result for SHA-256 83818ace7f4d9ad5…

MALICIOUS

PDF

76.5 KB Created: 2021-03-29 06:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 248761c6780ccd0df90bc24558f2fcc8 SHA-1: 97fffd4b8be9393c6d379d90bdf555f4c3a407f5 SHA-256: 83818ace7f4d9ad5f3ce87597a8e49366c241d754fc40205b150c8e155653fb2
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 0.9956

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://zajinet.ru/123?utm_term=o+babul+pyare+old+song PDF link annotation
    • http://vujenixuwo.mypressonline.com/mujifajerezibapigi.pdfIn PDF document text
    • http://pevazaw.mypressonline.com/90607300160.pdfIn PDF document text
    • https://nipetetoxijekuj.weebly.com/uploads/1/3/4/7/134718304/4290420.pdfIn PDF document text
    • http://duxeluwezix.iblogger.org/how_to_treat_a_cystic_pimple_on_cheek.pdfIn PDF document text
    • http://zigapajuxijado.mywebcommunity.org/how_to_do_colored_pencil_art.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/words_their_way_assessment_paper.pdfIn PDF document text
    • http://rezokivi.medianewsonline.com/fotup.pdfIn PDF document text
    • http://dazenad.iblogger.org/ventricular_arrhythmias_esc_guidelines.pdfIn PDF document text
    • http://topplafond.xyz/zibufebixasijafemuzadpmdhb.pdfIn PDF document text
    • https://xoxovumalojiru.weebly.com/uploads/1/3/0/8/130874224/fexefonejaranepewuti.pdfIn PDF document text
    • http://magnitoli-2ekran.site/mibukavarlml4.pdfIn PDF document text
    • http://jekeluxuto.mywebcommunity.org/40014503931.pdfIn PDF document text
    • https://putonikasobex.weebly.com/uploads/1/3/1/0/131070178/4512737.pdfIn PDF document text
    • http://raxewaponoxiv.mygamesonline.org/rogalakaganobisit.pdfIn PDF document text
    • http://spacexfoundation.net/gigilarot9vl1.pdfIn PDF document text
    • https://xapewagese.weebly.com/uploads/1/3/4/3/134314981/14de2fbd4aa44a.pdfIn PDF document text
    • http://gebigulexejo.sportsontheweb.net/administrao_financeira_groppelli.pdfIn PDF document text
    • http://jonotijero.medianewsonline.com/amortissement_comptable_ohada.pdfIn PDF document text
    • https://bazubipevudupu.weebly.com/uploads/1/3/4/8/134876407/cfc15be685b70b.pdfIn PDF document text
    • http://pemizirevubel.mywebcommunity.org/kugibudujevebesok.pdfIn PDF document text
    • http://kovuzaxaf.medianewsonline.com/92175242363.pdfIn PDF document text
    • http://sadipize.scienceontheweb.net/bosagavefaratamidit.pdfIn PDF document text
    • http://biwedujurar.mywebcommunity.org/ant_colony_optimization_example.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://toterow.rf.gd/nogija.pdfIn PDF document text
    • http://putunoxixowelo.atwebpages.com/public_budgeting_and_financial_management.pdfIn PDF document text
    • http://xetitonaj.rf.gd/noredelupipifanavidas.pdfIn PDF document text
    • http://tunizalureb.rf.gd/butterfly_fly_away_piano.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_off0000eaea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEA 5396 bytes
SHA-256: 43bbfb20ca8312638d66c5cb7780492dd97e2d761529cedc7a563abb8bc4bdf8
font_01_sfnt_off0000fd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD46 11760 bytes
SHA-256: ad09a23fa087cb1495c0ce1944342418f1487c8647743b42df43fd4b7c516ffd