Malicious PDF — malware analysis report

Static analysis result for SHA-256 635bdd810495e878…

MALICIOUS

PDF

70.1 KB Created: 2021-03-27 18:22:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2ec177b944aa47e04e2bec2c0071fecb SHA-1: 8125df0ade580a39ac33de98275aa7413703346d SHA-256: 635bdd810495e87802e65274eb887dcacb1b3834a85834a1c3ccfa251efff92d
166 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable hosting, and is flagged as a link farm. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to decrypt or access a password-protected archive, a common tactic for evading gateway security. ClamAV detection and ML classification further confirm its malicious nature, suggesting it's part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • 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://maypoin.ru/strik?utm_term=zyxel+c1000z+5ghz PDF link annotation
    • https://cdn.sqhk.co/feripamapuv/jjjfDij/futurama_worlds_of_tomorrow_mod_apk_ios.pdfIn PDF document text
    • https://kusavavatixe.weebly.com/uploads/1/3/4/8/134878613/kajavu_nusegipenadowi_bifewede.pdfIn PDF document text
    • https://kazowotamije.weebly.com/uploads/1/3/4/0/134012594/7a7fab0.pdfIn PDF document text
    • http://vurujupafowutox.mypressonline.com/how_do_you_know_if_you_have_too_much_salt_intake.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/ihgigjg/voxufunuzezodonomebuzipo.pdfIn PDF document text
    • https://tumazalewiguta.weebly.com/uploads/1/3/4/7/134755417/dokoduvanus.pdfIn PDF document text
    • https://tumunonapuve.weebly.com/uploads/1/3/1/3/131379134/wipufavinoxova.pdfIn PDF document text
    • https://kajizifobizixa.weebly.com/uploads/1/3/3/9/133997117/difinurijili-buxele-medoxaveke.pdfIn PDF document text
    • http://vogolimipogusoz.mypressonline.com/rokudixifujikoziluniwogo.pdfIn PDF document text
    • https://cdn.sqhk.co/sinewuvemomi/p0hdZxf/20030594706.pdfIn PDF document text
    • https://cdn.sqhk.co/nukasiwesex/emiajjr/90038949372.pdfIn PDF document text
    • https://matexofetuboso.weebly.com/uploads/1/3/1/4/131453592/7381381.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/iajcCje/world_cup_2022_stadium_wallpaper.pdfIn PDF document text
    • http://rusadezebep.mygamesonline.org/wrist_stretching_exercises.pdfIn PDF document text
    • https://jinonapipi.weebly.com/uploads/1/3/4/4/134481743/805d253ffe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lurarapekakaka.atwebpages.com/electronic_library_system.pdfIn PDF document text
    • https://s3.amazonaws.com/nafamaragisek/guzat.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/place_the_following_stages_of_mitosis_in_order.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/towofaru.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/wordpress_default_login_and_password.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/wojofi.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/coppelia_mazurka_sheet_music.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_off0000d573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD573 5072 bytes
SHA-256: 0a7a5b43f4dcbb569aa75e71e5da03af2853f75bfea7bb6867e829d7e7026ac4
font_01_sfnt_off0000e6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DD 10440 bytes
SHA-256: 80913f5062a585c992e9acae23ee509ebeae162d9632d614d12b8a80d8af34a5

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