Malicious PDF — malware analysis report

Static analysis result for SHA-256 40f523a009e053c9…

MALICIOUS

PDF

73.7 KB Created: 2021-03-18 13:06:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ec32ad9c385400b44c7c7e8b8ee0f103 SHA-1: efab5237a8264800c8d3c6840d780eda4271a342 SHA-256: 40f523a009e053c96f6caca6f522486a33c463dc0e814687aec44b0e12b2cdb1
126 Risk Score

Malware Insights

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

The PDF contains multiple external links, many pointing to disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/wix?keyword=the+umbrella+academy+pdf+t%25C3%25BCrk%25C3%25A7e PDF link annotation
    • https://futibiwis.weebly.com/uploads/1/3/1/4/131408183/69192212b.pdfIn PDF document text
    • http://b2b-servis.ru/64323143816l49pb.pdfIn PDF document text
    • http://faripofijukevom.mywebcommunity.org/4014099759.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzitomizaj/gdTqLih/sad_melody_piano_songs_classical.pdfIn PDF document text
    • http://xuzerujagojagip.scienceontheweb.net/how_much_do_security_dogs_cost.pdfIn PDF document text
    • https://xutevuper.weebly.com/uploads/1/3/0/9/130969179/6a32a03d13.pdfIn PDF document text
    • https://gojudewusidaza.weebly.com/uploads/1/3/4/8/134888042/mogugusigotaz_gusej_runogeresumomo_koponozam.pdfIn PDF document text
    • http://arendaavto.taxi/stanley_maxlife_369_tripod_manualcbogk.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/iihhef5/96373328558.pdfIn PDF document text
    • http://varistop.site/3101768979l11uo.pdfIn PDF document text
    • https://cdn.sqhk.co/nezusoxe/gjAhdjc/super_pro_drag_cars.pdfIn PDF document text
    • https://nigelatadumave.weebly.com/uploads/1/3/4/6/134615228/tepoxotet.pdfIn PDF document text
    • https://cdn.sqhk.co/fiseguvugele/aHnmHr7/nasimebibok.pdfIn PDF document text
    • https://cdn.sqhk.co/xopuwomu/1WhjidD/cake_decorating_instructions_for_beginners.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe9ecd02-16e3-4c1c-89b3-4035be803d50/58488407896.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/539eb905-9e44-40f1-9a32-a78fafd974dc/d_and_d_5th_edition_players_handbook_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/gutadimuz.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/biology_practical_notes_for_class_12.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/xijotejafupasinew.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/nivemat.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/8549600151.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_off0000e014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE014 5776 bytes
SHA-256: 5a70f02dd137c1fcb4e99289433d4b4cf0596b7e493b49a0f7fb35375226c2b1
font_01_sfnt_off0000f30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30F 11740 bytes
SHA-256: 3a4548cb2a9eda878681c9ce23cd369660fe2a708e68498e6a1d55d5c00d9f0f

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