Malicious PDF — malware analysis report

Static analysis result for SHA-256 73da16cc7f51c14c…

MALICIOUS

PDF

76.2 KB Created: 2021-03-23 05:21:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d83292d54ec9fdb1ec6b2b19de89b71f SHA-1: 4f54c59ae080bc17bcc4fe37c296eca6871805b0 SHA-256: 73da16cc7f51c14ca6e3c430b09a3001ee1d6ccc504bc4ee155a84de6abbb266
156 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 0.9991

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 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.
  • 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/award?keyword=brainwashed+by+tom+burrell+pdf PDF link annotation
    • http://kovatafob.mypressonline.com/wulimesevupolenupidufar.pdfIn PDF document text
    • http://xepidenad.scienceontheweb.net/tebesutem.pdfIn PDF document text
    • https://vesixogis.weebly.com/uploads/1/3/4/8/134863987/pofefusibi-revaz-wubanazi.pdfIn PDF document text
    • https://tusukufuduma.weebly.com/uploads/1/3/4/4/134458322/kolemikax.pdfIn PDF document text
    • http://milafikolume.iblogger.org/singer_style_mate_sewing_machine_reviews.pdfIn PDF document text
    • http://zoluvukabufe.iblogger.org/nosofododuvala.pdfIn PDF document text
    • https://pizavanaxuvilu.weebly.com/uploads/1/3/5/3/135386491/a6036518.pdfIn PDF document text
    • https://nobaloledajasom.weebly.com/uploads/1/3/2/6/132681012/fopoko_giwidezaza_tifesosigu.pdfIn PDF document text
    • http://sunufosabupes.scienceontheweb.net/how_to_identify_fake_id_cards.pdfIn PDF document text
    • https://dapevorejux.weebly.com/uploads/1/3/4/6/134695165/1241615.pdfIn PDF document text
    • http://pexulabin.iblogger.org/25996147267.pdfIn PDF document text
    • https://tinulesuse.weebly.com/uploads/1/3/4/6/134689832/5863214.pdfIn PDF document text
    • https://zedowami.weebly.com/uploads/1/3/1/6/131637063/bugabufube.pdfIn PDF document text
    • http://pubopogebam.22web.org/breast_pump_reviews_manual_vs_electric.pdfIn PDF document text
    • https://defasoxajex.weebly.com/uploads/1/3/1/4/131405962/bitetaboxegof.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/fefurorobumi/annuity_discount_factor_table.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/wii_snes_games_download.pdfIn PDF document text
    • http://rodedewezijore.atwebpages.com/41918411802.pdfIn PDF document text
    • http://miwewugewu.atwebpages.com/magukevovubifutidufuzom.pdfIn PDF document text
    • http://vexabimumemig.atwebpages.com/eos_quarterly_meeting_agenda.pdfIn PDF document text
    • http://xabudavadeguvo.myartsonline.com/completar_trinomio_cuadrado_perfecto.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/bapozanojafakaned.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/81530790860.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/59628566458.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_off0000ea63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA63 5664 bytes
SHA-256: e8e00e1b3f6dc38f9ccb89fdd2f71d0ad44e894cb4a7bda8057d8900eb80d46a
font_01_sfnt_off0000fd8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8F 11340 bytes
SHA-256: 07d67fc1edf9d5db8d01db1dc0468bb4111a993828f5ea326328e1b7750d48a7

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