Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff7e73e2dbb7ca3…

MALICIOUS

PDF

80.0 KB Created: 2021-04-08 13:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 2f62c9ca650394bf695acd8343291079 SHA-1: f0cc2bc605c92425baf5f13fdddee77fa52c0cc7 SHA-256: 5ff7e73e2dbb7ca3b3a699104649aebaabc36be913040e2f496e6f1f7416392c
166 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of 'LOLBin token sequence in document text' and the overall structure suggest an attempt to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://xajibur.ru/strik?utm_term=difference+of+squares+worksheet PDF link annotation
    • https://cdn.sqhk.co/lusajiki/83jjje5/space_engineers_xbox_one_controls.pdfIn PDF document text
    • http://suvonenexazu.mywebcommunity.org/52565438677.pdfIn PDF document text
    • http://kolagozisil.mywebcommunity.org/zuliki.pdfIn PDF document text
    • http://wipunemobak.mygamesonline.org/gawifefokexajopitajupig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387921/normal_5fe86808be7f2.pdfIn PDF document text
    • http://vk-settings-change.online/45536959018izz28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375702/normal_600e955cba214.pdfIn PDF document text
    • https://cdn.sqhk.co/lefuwaregew/jjhbjb7/sadefokifi.pdfIn PDF document text
    • https://cdn.sqhk.co/wisivelu/alnHiUw/78997781471.pdfIn PDF document text
    • https://nurosizakudagag.weebly.com/uploads/1/3/4/6/134699554/3578596.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365639/normal_5fd9920204fc5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445890/normal_5fde580e89029.pdfIn PDF document text
    • http://creditscorerepair.info/mowenosemavatutuzupok6p4a9.pdfIn PDF document text
    • https://cdn.sqhk.co/nokikijun/hchcjgc/bhairava_dweepam_mp4_video_songs.pdfIn PDF document text
    • https://demuxovepeb.weebly.com/uploads/1/3/4/3/134311881/2726531.pdfIn PDF document text
    • https://pibefugaradaxo.weebly.com/uploads/1/3/1/3/131398186/198ba58e5ac4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417992/normal_603670db38546.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/how_to_restart_router_using_cmd0nu73.pdfIn PDF document text
    • http://krokoboko3.xyz/how_to_unlock_greatcall_jitterbugxa89p.pdfIn PDF document text
    • http://wajuxerisowo.iblogger.org/zigazuv.pdfIn macro / runtime command snippet
    • https://vedexojofidas.weebly.com/uploads/1/3/4/5/134581268/diwovugubazemiro.pdfIn macro / runtime command snippet
    • https://tuxinotem.weebly.com/uploads/1/3/4/8/134883911/98fbece0c7.pdfIn PDF document text
    • http://naturalgood.space/no_mans_sky_crystal_sulfidei956g.pdfIn PDF document text
    • http://krokoboko3.xyz/how_to_unlock_greatcall_jIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pabotojixupi.atwebpages.com/fafanepopasabaguxo.pdfIn PDF document text
    • http://xitirinajeki.epizy.com/89883254315.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_off0000fc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC49 5216 bytes
SHA-256: c68caa29a21d6a4b81f504c451563ba3dedb0beb66e0c68c2d1f0a51e7e902cd
font_01_sfnt_off00010e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E29 10520 bytes
SHA-256: 0b4fc840b75dc3a9fe25554a53ee490b93f3f6e1cc7c7d5d66b421fd5801d4ae