Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b09635353646fb…

MALICIOUS

PDF

77.5 KB Created: 2021-03-06 12:04:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f5aab97802a43072e5ff64d47b9b6769 SHA-1: 552ba246559815125f1f91a479519b5063188846 SHA-256: 71b09635353646fb2fc6552d0a2c3176e53aa28970857f60056e99ecaa1391e9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic firings reveal it contains a mass of external links, with many hosted on disposable domains, suggesting a link farm or redirection scheme. One of the embedded URIs, 'https://botokaw.ru/wb?keyword=twitter%20sportscenter%20argentina', is likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://botokaw.ru/wb?keyword=twitter%20sportscenter%20argentina PDF link annotation
    • https://komijeji.weebly.com/uploads/1/3/1/6/131606126/4493727.pdfIn PDF document text
    • https://cdn.sqhk.co/nexasolonit/hhaQvhg/meltdown_apk_premium.pdfIn PDF document text
    • https://cdn.sqhk.co/fukafodifi/J5Fiigh/scanner_app_to_tapscanner_mod_apk.pdfIn PDF document text
    • http://mapizemi.22web.org/how_to_find_my_hp_printer_wifi_password.pdfIn PDF document text
    • https://sivavodafewe.weebly.com/uploads/1/3/4/4/134484486/a5b265941ee.pdfIn PDF document text
    • https://dapalirodo.weebly.com/uploads/1/3/1/4/131483520/puvaz_xixik_linadoduso_fubalurez.pdfIn PDF document text
    • http://tesigelilojir.iblogger.org/practical_english_usage_michael_swan_3rd_edition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xewajube.epizy.com/52294479092.pdfIn PDF document text
    • http://famuruvif.epizy.com/anjana_songs_ming.pdfIn PDF document text
    • http://fidosofesus.rf.gd/addepar_annual_report.pdfIn PDF document text
    • https://a9750898-a066-404d-a796-54a2f5ad13bb.filesusr.com/ugd/60231a_88083625bd864e95a759dae2c48d8837.pdf?index=trueIn PDF document text
    • https://9abff256-b119-4e75-a612-dfc075f5428e.filesusr.com/ugd/c73517_30242285e7364fc4a73a330eb9129f2e.pdf?index=trueIn PDF document text
    • http://nuzetewadan.epizy.com/8._4_angle_relationships_answer_key.pdfIn PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_01a8bbfd0d25423c82a27569d49c9216.pdf?index=trueIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_c72aa9d316d44db59be41f3dab1eb02a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ea0bf6e-e675-49ed-9dcb-9cd28358252f/ejercicios_de_razones_trigonometricas_en_triangulos_rectangulos_resueltos_doc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a1a6f47-1018-4d86-aa5e-6ebf6f02d4c0/i_am_only_one_call_away_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f403c266-f37d-467f-be55-02ed92143700/guwuvafidomezazimosuvo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85820da2-d52e-4a9d-afc7-b1b24a0d9d99/mizukule.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC32 5108 bytes
SHA-256: 60e6ebc1d050f69317c5968d789efbb874a64352cae42313e0d900d41f1182cc
font_01_sfnt_off0000ddb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB9 11060 bytes
SHA-256: 7884d588a559b16189890bdf2030895f6733c05e40f5f5d54a73dc3913a65d83
font_02_sfnt_off0001002d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002D 12896 bytes
SHA-256: 9acb89ba73dc12b5a4e3689574802a867ba353ae90c5eb5ed424f2c705b28d94