Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a56475e138b72fa…

MALICIOUS

PDF

78.0 KB Created: 2021-04-21 05:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5625a8f127694323fda20d800dbe0d51 SHA-1: 43b6f1aec9500f537372c184290a8cc20f4a17fa SHA-256: 9a56475e138b72fa36382bf0161b2804117e129aae8d4acbc20a52630661db60
166 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including ML classifiers and ClamAV, indicating malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of 'wkhtmltopdf' in metadata and the heuristic 'SE_LOLBIN_RUN_COMMAND' point towards potential exploitation or obfuscation techniques within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/strik?utm_term=is+sword+art+online+anime+finished PDF link annotation
    • http://fejugutafilevin.scienceontheweb.net/67170047728.pdfIn PDF document text
    • http://pepariravifaza.getenjoyment.net/74203375552.pdfIn PDF document text
    • http://kernig.pro/38639193810ac7vx.pdfIn PDF document text
    • http://ig-copyrightviolation.com/bajenonojijesovirovonurargvp7t.pdfIn PDF document text
    • http://i-men.ru/movakawowamizuravuzedg26q.pdfIn PDF document text
    • http://pojapir.mygamesonline.org/furijupunufuvisuba.pdfIn PDF document text
    • https://cdn.sqhk.co/wisulekekij/2LhiieE/como_hackear_my_talking_tom_gold_run.pdfIn macro / runtime command snippet
    • http://duwuzoruperiged.scienceontheweb.net/family_camping_checklist.pdfIn PDF document text
    • http://christinaanddavid2019.com/redediniregesggzxn.pdfIn PDF document text
    • http://invitesistem.ru/lavonaguvubazizaluwunugu2f.pdfIn PDF document text
    • https://cdn.sqhk.co/tovisegag/hbidhaX/downtown_manhattan_trendy_neighborhood_crossword_clue.pdfIn PDF document text
    • http://dsv-trening.ru/what_is_the_heat_symbol_on_mitsubishi_air_conditionermaa2a.pdfIn PDF document text
    • http://reduslimitalia-oficial.site/sonic_menu_specials_for_todays8itw.pdfIn PDF document text
    • http://storeplus.pro/jipupadaror0rbpx.pdfIn PDF document text
    • http://pojapir.mygamesonline.org/furIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lugetobuzisufa.rf.gd/7562674999.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/nonovebigo.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/bicep_curls_dumbbell_form.pdfIn PDF document text
    • http://kogotiru.myartsonline.com/59467875058.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/bruno_mars_marry_you_video.pdfIn PDF document text
    • http://womopemi.epizy.com/asus_rt_ac68u_reset.pdfIn PDF document text
    • http://jonizuxupofewow.rf.gd/gmat_data_sufficiency_practice_test.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BD 4964 bytes
SHA-256: c6a49abc069e4b7a2fe41d6fbe5d98d1df60b11d180ad90fb438bf527a8ca8df
font_01_sfnt_off0000f972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF972 10184 bytes
SHA-256: d56ed32ab8bba74cdabc23aed31c9d12c787640eff5ffaf92230be9b5320d8b0
font_02_sfnt_off00011c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5C 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34