Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e03bf106505be55…

MALICIOUS

PDF

175.4 KB Created: 2021-05-11 19:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6195025c33bcf81cd2cd9b03787f9a2b SHA-1: 5531dd5ddab9ecfdff499a40e2e8a8aea4d9def9 SHA-256: 9e03bf106505be55aedaa01d094c1253a7fb4deb5457e6e8d85ec396d7286b0c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm and by ML classifiers as malicious. The ClamAV detection 'Pdf.Phishing.Trojan' further supports a phishing or malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'Julius Caesar full play pdf', directing users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://seumenha.ru/strik?utm_term=julius+caesar+full+play+pdf
    • https://static.s123-cdn-static.com/uploads/4384831/normal_5ffe9b8f5e118.pdf
    • https://static.s123-cdn-static.com/uploads/4465538/normal_6009a4280b92b.pdf
    • https://cdn.sqhk.co/fugovigul/ie329cy/46469111566.pdf
    • https://static.s123-cdn-static.com/uploads/4455898/normal_5fddd58517215.pdf
    • http://borezopesane.22web.org/backup_chrome_history_android.pdf
    • http://zunelujone.iblogger.org/what_is_the_american_education_system_based_on.pdf
    • http://nozariwijuzufu.iblogger.org/tanujap.pdf
    • https://cdn.sqhk.co/sozaxejiv/ViipExs/dead_trigger_2_pc_download_softonic.pdf
    • https://cdn-cms.f-static.net/uploads/4482863/normal_60309cb402151.pdf
    • https://cdn-cms.f-static.net/uploads/4382186/normal_604492a5e5600.pdf
    • https://cdn.sqhk.co/gadewekunel/hiMjjBX/4444154586.pdf
    • http://ramosek.iblogger.org/cantate_domino_heinrich_schtz.pdf
    • https://cdn.sqhk.co/bisuligiga/jjjjbe8/cnc_programming_principles_and_applications_by_mike_mattson.pdf
    • https://cdn.sqhk.co/mikevoponage/gdhjigF/r-_type_3_super_nintendo_rom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://megomofa.rf.gd/dasavifudafeki.pdf
    • http://rovafitazilom.epizy.com/zetewojo.pdf
    • https://s3.amazonaws.com/safago/milady_esthetics_chapter_19_workbook_answers.pdf
    • http://rezazaje.epizy.com/28730069217.pdf
    • http://rowesotinik.rf.gd/harman_p68_manual.pdf
    • http://begulazelukej.rf.gd/55678876554.pdf
    • https://s3.amazonaws.com/minegikukovel/7878503175.pdf
    • https://s3.amazonaws.com/wuniku/apa_format_citation_page.pdf
    • https://s3.amazonaws.com/pibabopuduj/sudoposinavopeletizowu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00026cb3.bin
c1301843fe0e736f5175833fb2c0df3c5d878bd66b9547d8352fa0bbd146dcec
pdf-font-stream PDF embedded font (sfnt) at offset 0x26CB3 4824 bytes
font_01_sfnt_off00027d2f.bin
c8a789243b9fbb001a43764471af51717b50aea038df98e991e10f4352cddda4
pdf-font-stream PDF embedded font (sfnt) at offset 0x27D2F 10800 bytes
font_02_sfnt_off0002a15a.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x2A15A 4324 bytes