Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ff8356f71cb848…

MALICIOUS

PDF

87.9 KB Created: 2021-03-23 14:13:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 70b27a22389959d16fbb64546f814316 SHA-1: 91a04699d8cc65bb51b7512d4d3a8101807d6c04 SHA-256: 58ff8356f71cb848b83baf0160611ab523c526b3d7f80c7b1d65660459d13791
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 0.9977

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 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://jacksth.ru/wix?keyword=fnaf+1+office+drawings PDF link annotation
    • http://itprod.space/g_shock_rangeman_9400jlqek.pdfIn PDF document text
    • http://expo-kit.ru/sadasexanekosofth9j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466391/normal_601c85d873277.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468261/normal_5fd2ceb89e351.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478683/normal_5ff042547d0d4.pdfIn PDF document text
    • http://betmoy54.com/john_locke_essay_concerning_human_understanding_book_1kjzbq.pdfIn PDF document text
    • https://cdn.sqhk.co/vetukalujir/oXhiofh/60648265798.pdfIn PDF document text
    • http://rusagobaloregir.22web.org/kayaking_merit_badge_workbook_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/xogixute/gexMkfP/escape_impossible_revenge_level_1.pdfIn PDF document text
    • http://yewes.fun/464720160590as6s.pdfIn PDF document text
    • http://ig-copyrighthelpcenter.com/dabusatsywzd.pdfIn PDF document text
    • https://cdn.sqhk.co/lokovipazal/aiiiaig/love_ringtones_music.pdfIn PDF document text
    • http://wordwild-store.com/advanced_linux_system_programminggdn03.pdfIn PDF document text
    • http://biweekamnf.com/mine_bitcoin_on_android_2019gmec2.pdfIn PDF document text
    • http://ludshop.xyz/will_cyberpunk_2077_be_on_ps5_at_launchk1s32.pdfIn PDF document text
    • http://mesretly.xyz/decodificador_de_7_segmentosf04zt.pdfIn PDF document text
    • http://linza.media/peminojo6zei1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f1801c53-b3f5-4b94-a9b3-4bb8eb376a66.filesusr.com/ugd/af633f_0d43f62946c74008b40248bb379476d0.pdf?index=trueIn PDF document text
    • https://46c19374-600d-43be-a5f2-d8bf07c6fddf.filesusr.com/ugd/cc94a4_e7209358cc5342469852ce97a33aa652.pdf?index=trueIn PDF document text
    • http://dumudolaba.epizy.com/39101701125.pdfIn PDF document text
    • http://nasapatede.epizy.com/59593592028.pdfIn PDF document text
    • https://a581e706-3bf6-41fb-8978-ad4d4077590d.filesusr.com/ugd/afbe6b_38f685124f0049e794ca0f97701a5200.pdf?index=trueIn PDF document text
    • http://nowonijefug.rf.gd/sanford_guide_for_antimicrobial_therapy.pdfIn PDF document text
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_f6bfcba32274405c890f91935c793439.pdf?index=trueIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE721 6440 bytes
SHA-256: a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c
font_01_sfnt_off0000f715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF715 5256 bytes
SHA-256: ed3aa276169d5d09c39778e69508bcb0bbeaa8b5472d879073f73625542cfa90
font_02_sfnt_off0001091f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091F 2540 bytes
SHA-256: 1ba1acfe3e0fea94145c5c70bc69c0e3196ea5df181a479ffdd29b9d1b301322
font_03_sfnt_off0001136b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136B 10964 bytes
SHA-256: 0a3a907b30cd915f45984a6e9ea4acdd82d286bd3f03d34d5df36ae245b38d9e
font_04_sfnt_off00013924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13924 16788 bytes
SHA-256: 55aa62e09f0b913aa4244cc589186b8ad438734bcbee5d35360a47e417d44f01