Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa5b41812112a83f…

MALICIOUS

PDF

85.3 KB Created: 2021-04-19 23:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 58b41ff771be95dae2de92f6d6ffdefd SHA-1: 15419a82f5ed51ac5ceb01910779bb4cd57075c1 SHA-256: aa5b41812112a83f5e0a827773dffc4bf578067fcba3844a5d82f46aba2fd988
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. Heuristics indicate a password-protected archive lure and a download button, common tactics for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/strik?utm_term=rosetta+stone+4.5+5+activation+code PDF link annotation
    • https://cdn.sqhk.co/bapulofuw/t4jftq1/duck_hunting_game_online_download.pdfIn PDF document text
    • http://makamar.tech/14669904063ppccw.pdfIn PDF document text
    • http://bbcua.site/vumalirewev8yu7e.pdfIn PDF document text
    • http://gojevomarokabe.getenjoyment.net/kisepepupuxulabiw.pdfIn PDF document text
    • https://cdn.sqhk.co/gopilufifeda/eNEpPih/cannon_shooting_story.pdfIn PDF document text
    • http://jekefidaz.mygamesonline.org/vampire_diaries_originals_cast_names.pdfIn PDF document text
    • http://kirudikegopoded.sportsontheweb.net/98109390647.pdfIn PDF document text
    • http://subbellassecret.com/99842185136ovy14.pdfIn PDF document text
    • http://gatorama.site/bombsquad_vr_apkpureucidc.pdfIn PDF document text
    • http://jigapenufi.medianewsonline.com/xojijalivotemu.pdfIn PDF document text
    • http://copyrighthelpcentral.com/dipufixonuriverolevewlpm66.pdfIn PDF document text
    • http://cybety.xyz/fast_driver_3d_downloadjyc7x.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/bhhbk9X/53774468501.pdfIn PDF document text
    • http://fufirewavit.getenjoyment.net/john_milton_paradise_lost_book_4.pdfIn PDF document text
    • http://tiwujatujoput.mygamesonline.org/83213745644.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarimeg/kfNjchg/pirujo.pdfIn PDF document text
    • http://7lessons.site/52912574485anc0t.pdfIn PDF document text
    • http://sosogemizibu.mypressonline.com/4135252356.pdfIn PDF document text
    • http://hushseo.online/how_to_do_an_average_of_an_average22c43.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8b8c7005-3af0-45a1-8e5b-a6902caa9335.filesusr.com/ugd/dbd7d9_fcdce88c10de411dbb29dfda1ffe586d.pdf?index=trueIn PDF document text
    • http://foduxidepozipiw.myartsonline.com/bread_making_process.pdfIn PDF document text
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_71981d9f257e41ce8ddaca4f74f2d756.pdf?index=trueIn PDF document text
    • http://sugamane.onlinewebshop.net/streamline_english_connections_workbook_b.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6B 5116 bytes
SHA-256: f651af34e4c056d43882ac79618c0bdc19408f3039ac805d1be75f95fbd2b030
font_01_sfnt_off0000ff08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF08 12704 bytes
SHA-256: 79657085d0f83f6f07a06cdcc6e02e17fc04b953492449b707c95e959f45a0fb
font_02_sfnt_off00012864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12864 18752 bytes
SHA-256: 68bb3a222637ad1960ea29580b050cceb92de7d7f673ad8b2c15fad0007742f6