Malicious PDF — malware analysis report

Static analysis result for SHA-256 6967d8ca7cbe44b2…

MALICIOUS

PDF

78.9 KB Created: 2021-03-28 22:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 191d1d5b6075238932882fed62911a10 SHA-1: 5bba76134fedefaaf99db97f65a94fa2b9a05320 SHA-256: 6967d8ca7cbe44b2ffc26085200e27d9ffe9750fa96c42167db67f11deb169e5
186 Risk Score

Malware Insights

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

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 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/wix?keyword=download+bloons+tower+defense+5+mod+apk PDF link annotation
    • http://study-english-04.space/is_tableau_free_for_studentsk0cov.pdfIn PDF document text
    • https://sedozexejelem.weebly.com/uploads/1/3/1/8/131871533/zutokaj-mofuviru-tomipubavi.pdfIn PDF document text
    • https://bofetolukolun.weebly.com/uploads/1/3/4/0/134018575/zanalirimunofemuli.pdfIn PDF document text
    • http://lightsex.ru/gujofiwigebokfo3c.pdfIn PDF document text
    • http://creditscorecard.info/headline_newspaper_templated9t3p.pdfIn PDF document text
    • https://voledepegos.weebly.com/uploads/1/3/1/4/131407008/6878614.pdfIn PDF document text
    • http://bella24.xyz/18016796652pq6ft.pdfIn PDF document text
    • http://romeita.space/evaluate_the_algebraic_expressions_worksheet3b2nk.pdfIn PDF document text
    • http://sarhello.online/the_biggest_loser_episodes_online_freexc5t7.pdfIn PDF document text
    • http://creditstar-kabinet.com/rodelatulawevenugulapus18rn4.pdfIn PDF document text
    • http://ontrade.top/bose_remote_control_codes_listz794s.pdfIn PDF document text
    • http://expo-kit.ru/oklahoma_prentice_hall_world_history_the_modern_era_answersok954.pdfIn PDF document text
    • http://axecheat5.xyz/wizut3u8hg.pdfIn PDF document text
    • http://cookwellbakewell.com/darigevadijozofonopogex4t962.pdfIn PDF document text
    • http://generatorsale.ru/22496882114b23uw.pdfIn PDF document text
    • https://bisowepot.weebly.com/uploads/1/3/4/5/134598436/ae14734ec898c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_4233f309889f4fafb0a8b1abf9bce8af.pdf?index=trueIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_3a091bc5e3b149fe83f76b8c46077128.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/pes_cavus_equinovarus_deformity.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/asmaul_husna_adalah_nama_nama_allah_yg.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/xugivenubexug.pdfIn PDF document text
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_fa0148e5d5084b0dbf0ef2d02a0ab763.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_off0000ea18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA18 5608 bytes
SHA-256: d9680c18b23a0e6cf2717bbf47027805edc4ef2e63ec157126cbe9b0d252e8be
font_01_sfnt_off0000fd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD26 15048 bytes
SHA-256: 2280eb0705d850d4e453a722264bbcaf16961d5907e7f89a79483f0835bc1318

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