Malicious PDF — malware analysis report

Static analysis result for SHA-256 633a9db2dc5553bb…

MALICIOUS

PDF

73.4 KB Created: 2021-02-16 08:18:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: db9e56e7c415a3e06cc60d63865822ec SHA-1: fd455764c2c2e1b1cdede4425897c987569117fa SHA-256: 633a9db2dc5553bb88af791fb335dfcd4ca481bea932d5c75713934134e7eb9a
136 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is malicious and uses a password-protected archive lure, suggesting it aims to deliver a payload. The embedded URL points to a domain associated with search terms for software cracks and activation keys, reinforcing the phishing lure. While no scripts were directly extracted, the PDF structure and external URL suggest it is part of a phishing campaign designed to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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
  • 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/wb?keyword=eset%20smart%20security%208%20activation%20key%20license%20crack%20download PDF link annotation
    • http://krokoboko3.xyz/2261945323136r8f.pdfIn PDF document text
    • http://study-english-04.space/15179969777s4z57.pdfIn PDF document text
    • http://fringigejy.site/sunbeam_bread_maker_model_5833_manualck499.pdfIn PDF document text
    • https://cdn.sqhk.co/gixejefi/Vgcsjji/play_games_earn_money_website.pdfIn PDF document text
    • http://on24-system.club/12983650115674bl.pdfIn PDF document text
    • https://cdn.sqhk.co/xazururoxe/bYEMThf/2205741231.pdfIn PDF document text
    • https://cdn.sqhk.co/bulegumu/ejeajgZ/660100138.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/ghIP5ih/fast_rider_moto_bike_racing_mod_apk.pdfIn PDF document text
    • 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
    • https://s3.amazonaws.com/fipijife/jingle_bell_music_sheet_clarinet.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/formation_biodynamie_belgique.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/myers_briggs_types_test.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/iv_iron_therapy_guidelines_in_pregnancy.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/lowercase_letter_g_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/84158100249.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/game_brother_in_arms_apk_obb.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/embolizacion_de_aneurisma_cerebral.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/96766793123.pdfIn PDF document text
    • http://vanudedu.epizy.com/jinko_solar_pv_module_datasheet.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_off0000d303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD303 5436 bytes
SHA-256: 28f0d96506dc9a13068369188ac8f428ea8a6fc5238643993d9abf8dc092a062
font_01_sfnt_off0000e57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57D 10704 bytes
SHA-256: 5d85076d5c6409fa6aa0a1ce4159a9d747aa9ff7afec267ac9c465a3d147ae62
font_02_sfnt_off000109ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EF 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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