Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9319fef2b6c1068…

MALICIOUS

PDF

81.4 KB Created: 2021-02-27 18:22:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2d4a2df8b782d905e1ade42e1628f74c SHA-1: 239a7cc467de9d5c717f8f6fc74bfdf0c317b085 SHA-256: b9319fef2b6c1068de0aca8c4f4a63a26c9fa0213ba756399a95815487811177
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 0.9997

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://xezojetit.ru/123?utm_term=huckleberry+finn+film+1993 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408004/normal_602d5e7734c21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408983/normal_603a1b3105b19.pdfIn PDF document text
    • http://agencymedia-ig.com/fantasy_premier_league_gameweek_33_captainoa3lu.pdfIn PDF document text
    • http://xesapuwax.mywebcommunity.org/telafamomagiminokoxudutuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466366/normal_5fc8713e6bbbd.pdfIn PDF document text
    • https://suguturame.weebly.com/uploads/1/3/1/4/131438741/zerukepubuvifeb_kekif_xivirumiretijug.pdfIn PDF document text
    • http://websporizle3.com/meleporinemibefutikewit0d82.pdfIn PDF document text
    • http://cccckkkkkdd.space/best_bhagavad_gita_book_in_telugui4pze.pdfIn PDF document text
    • https://pigumetazemebet.weebly.com/uploads/1/3/0/7/130775485/nabavetarufus_rudobuvuti_waretazaz.pdfIn PDF document text
    • http://boevoenlp.com/stanley_garage_door_bottom_weather_seal_canada6cyb9.pdfIn PDF document text
    • https://cdn.sqhk.co/nakizenonetu/V5NidVq/61824041.pdfIn PDF document text
    • https://pagugedupe.weebly.com/uploads/1/3/4/2/134266786/ac993f8c2.pdfIn PDF document text
    • http://sodalabs.pro/84826523827o3gqp.pdfIn PDF document text
    • https://cdn.sqhk.co/sejiragidu/HNJibGT/samurai_warrior_heroes_of_war_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365601/normal_5ffc9fc739e6e.pdfIn PDF document text
    • http://milanomoda-italy.site/compare_two_excel_sheets_data_onlinei1oed.pdfIn PDF document text
    • https://cdn.sqhk.co/libegavezu/ihqjhsB/97540250265.pdfIn PDF document text
    • http://the-job.ru/nasa_asteroid_warning_november_2020fj3nc.pdfIn PDF document text
    • http://termometr-medikal.site/53088915498qqsg7.pdfIn PDF document text
    • http://duwudivusupo.mygamesonline.org/1271621841.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fojakosi.atwebpages.com/clicker_universal_keypad_reprogram.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_off0001006b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006B 5276 bytes
SHA-256: 7f562d9f121604bcb963834dee0ce82124b23efb0677035be1853576fe4f5eaf
font_01_sfnt_off00011262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11262 11252 bytes
SHA-256: 6d1f831cdb2fc44cd18c7c90c043264d387deece3049b9f08703abab11d9b26c