Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b5c182325c1f2b…

MALICIOUS

PDF

106.8 KB Created: 2021-03-23 05:31:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c17ce8a1791c79027baa5386c08565a0 SHA-1: b7a2edbb549d9d6fcfdc36105e7dee7c10b1b985 SHA-256: 93b5c182325c1f2bdd01b3181a7298e30f159d50d2390669aa9a1d948a1fc9c8
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with one specifically appearing as a search result for 'chander pahar story in bengali pdf'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous links on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://soxebez.ru/award?keyword=chander+pahar+story+in+bengali+pdf PDF link annotation
    • http://antinomi.design/translations_worksheet_answer_key_math-aids.comnbh2a.pdfIn PDF document text
    • http://mikrotikwizard.com/bidixagolimubl6r1j.pdfIn PDF document text
    • http://vivanazesile.iblogger.org/41043746993.pdfIn PDF document text
    • http://sun-italy.space/fobilivilexayyd6x.pdfIn PDF document text
    • http://rolevuses.iblogger.org/jajemisilusuza.pdfIn PDF document text
    • http://it50save.info/goat_simulator_waste_of_space_trophy_guideh32a5.pdfIn PDF document text
    • http://jabofuzo.22web.org/go_math_3rd_grade_homework_book_answers.pdfIn PDF document text
    • http://bloodcraft.online/headset_gaming_murah_terbaik_untuk_androidkddxb.pdfIn PDF document text
    • https://doxizuzipoleri.weebly.com/uploads/1/3/5/3/135323895/0841f.pdfIn PDF document text
    • https://lelibajoterudu.weebly.com/uploads/1/3/4/0/134042739/kutalofalevolal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fepapemifen.epizy.com/2017_consumer_reports_vehicle_reliability.pdfIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/m_audio_fast_track_pro_drivers_free_download_for_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/borokegujuzero/25601499469.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/60467070262.pdfIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_458a410340c44e00884f82929d3fdc4a.pdf?index=trueIn PDF document text
    • http://mekofeju.epizy.com/acl_tear_treatment_guidelines.pdfIn PDF document text
    • http://gojejamajutemus.epizy.com/livep.pdfIn PDF document text
    • http://pirefalanife.epizy.com/sazazajuma.pdfIn PDF document text
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_7cc5e934561341f7a2abc5eb8b0f93a5.pdf?index=trueIn PDF document text
    • http://doronelibi.rf.gd/quartiles_and_percentiles_worksheets.pdfIn PDF document text
    • https://804b95bc-9ca4-448d-a094-5a8e1ff69a26.filesusr.com/ugd/99d1da_b1899e810a3f4cfaaf1ffd1187dcb313.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/atheros_wireless_lan_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/9779322673.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEC 5452 bytes
SHA-256: 4d1fed6c9942a6085e74512a3f224ce13f6090bf064279eba7d1f650cbd6846f
font_01_sfnt_off00011e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6A 24376 bytes
SHA-256: f2b2542c76116399680915bb7d9a6914742abf8de3729336284338715be17bd2
font_02_sfnt_off0001605f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1605F 11776 bytes
SHA-256: 7de577217e61bc98763ec6de0f0fb6ff64e5c5257f982f94f0d266189a978414
font_03_sfnt_off000187d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187D4 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8