Malicious PDF — malware analysis report

Static analysis result for SHA-256 865dc23e2dbfcbca…

MALICIOUS

PDF

76.3 KB Created: 2021-02-13 09:32:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ffcb517be0771e9a8407f1a051f6fe09 SHA-1: 73511b299d303343c26fa2833cd3bea2d432fd61 SHA-256: 865dc23e2dbfcbca360ac6b74e3c7b5095985d1867150357665d4509165e0943
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 0.9998

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://crophysi.ru/wix?keyword=skyrim+valdr+won%2527t+talk+to+me PDF link annotation
    • http://private-channel.site/guidebook_app_download_for_androidhss38.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/didiGAr/43197520349.pdfIn PDF document text
    • http://potolkilife.ru/dpwh_school_building_plansnxpbs.pdfIn PDF document text
    • https://cdn.sqhk.co/womawuxinuge/bijZijG/66040393523.pdfIn PDF document text
    • http://icub.tech/62414780367qf2gn.pdfIn PDF document text
    • http://metikinave.22web.org/prokaryotes_bacteria_and_archaea_worksheet.pdfIn PDF document text
    • http://roworesezakor.iblogger.org/nozosaxipaxadisazopiw.pdfIn PDF document text
    • http://1xbet-football.fun/94679249424pl1ai.pdfIn PDF document text
    • https://sixebujexe.weebly.com/uploads/1/3/0/7/130740217/tuvirixow_jovofexijam_kadutaw.pdfIn PDF document text
    • http://xumumat.22web.org/sage_200_accounting_system_manager_user_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/kusamika/Xghhgjd/77641487520.pdfIn PDF document text
    • https://cdn.sqhk.co/mizogujuzo/g55Kcnr/amazon_music_app_download_failed.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/nafibanefexex/bixar.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/56481010683.pdfIn PDF document text
    • http://ganesuk.epizy.com/jumufoxanukupimudoxik.pdfIn PDF document text
    • http://telimagafire.epizy.com/58136628737.pdfIn PDF document text
    • http://resibifamopoto.rf.gd/bitstream_font_navigator_2006.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/ordinary_day_logic_song.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/19377356740.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_off0000ef17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF17 5248 bytes
SHA-256: dc79b181feeb8d294ad734ffc10e263c01c4ecc72645ba8aac0fcd1f2106804a
font_01_sfnt_off000100fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FA 10276 bytes
SHA-256: 17ca138468eb33f958c7aa68349024b93034602d55faf19d529acac1ab971a48