Malicious PDF — malware analysis report

Static analysis result for SHA-256 68dc633ae234a309…

MALICIOUS

PDF

76.6 KB Created: 2021-03-03 13:48:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: cdd5c9af6c9d16f0df2d6211c8880405 SHA-1: d68078798b0c543e0dbac225492b82c6475a6150 SHA-256: 68dc633ae234a30946d0ab8e814c615128c0082a36ab73f3dd75eef4bd1b3bc8
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with one prominent URL (`https://jottigo.ru/strik?utm_term=braava+240+review`) suggesting a lure related to a product review. The PDF structure and the presence of external URIs indicate an attempt to redirect the user to a potentially malicious site, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/strik?utm_term=braava+240+review PDF link annotation
    • http://tesepaxe.iblogger.org/30120769382.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366639/normal_6015c2a0e26cd.pdfIn PDF document text
    • https://cdn.sqhk.co/timemowab/iiiidjc/change_taskbar_color_windows_10_1903.pdfIn PDF document text
    • https://vixadabunukup.weebly.com/uploads/1/3/4/9/134902839/1996073.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/xbSjcR2/yellow_wallpaper_summary.pdfIn PDF document text
    • http://xidotamasaw.22web.org/xawozupemopomu.pdfIn PDF document text
    • https://nibowivuxewanu.weebly.com/uploads/1/3/1/3/131379040/607569.pdfIn PDF document text
    • https://cdn.sqhk.co/nowonipewo/bCQl34y/clash_of_legendary_titans_mod_apk.pdfIn PDF document text
    • https://tedozumezefa.weebly.com/uploads/1/3/2/7/132740670/c9b7b1a5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424689/normal_60100893b3040.pdfIn PDF document text
    • https://cdn.sqhk.co/zolilogifuxe/gjhahg3/petulagojesipuredep.pdfIn PDF document text
    • https://toripifisesu.weebly.com/uploads/1/3/4/3/134367164/3708151fecee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bumumewevebav.epizy.com/zaroxadikufezuxem.pdfIn PDF document text
    • http://fitimulosegi.epizy.com/keminerobodugezuda.pdfIn PDF document text
    • http://vujapaporetakik.epizy.com/risk_assessment_sheet_excel.pdfIn PDF document text
    • http://mujofekiroteped.epizy.com/agile_transformation_case_study.pdfIn PDF document text
    • http://tisudaxutuz.epizy.com/insulation_sheet_for_shed.pdfIn PDF document text
    • http://gedaseda.rf.gd/ripetowat.pdfIn PDF document text
    • http://zalijes.rf.gd/lorebimedoxe.pdfIn PDF document text
    • http://rukotig.rf.gd/korean_alphabet_writing_practice_sheets.pdfIn PDF document text
    • http://zapesuxeliribi.rf.gd/31316864804.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_off0000f115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF115 5032 bytes
SHA-256: 7c5bc93c3e6baaec3cd44781bffff235bb1d56445956254e349f4a096d9c411d
font_01_sfnt_off0001025c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025C 10344 bytes
SHA-256: 5e779000d998bd09b7f5a3ef97560efcfdd6b8d9e6568ec778ccd886dcae41c8

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