Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ba907f18fde8178…

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 06:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ed23eeaa9a669ede3bd59fe666eeb10c SHA-1: d6e9682f9e59f5c83b524fc56cf533be2d36ab5a SHA-256: 7ba907f18fde81782e712826ecbea057bb4bee93b4d86e2994b383a30da9f8ae
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains numerous embedded URLs pointing to PDFs hosted on various domains, consistent with a link farm designed to distribute malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true malicious destination. No scripts were extracted, but the overall structure suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pistant.ru/uplcv?utm_term=fast+scanner+app+download+apk PDF link annotation
    • http://runwellconsulting.com/file/file/68885235579.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/nolafekaj.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/56643314177.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109030826143611.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc0534c137---bowajubivobezazuvoti.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/nujaletifagurizifekulopu.pdfIn PDF document text
    • http://millecolori.it/images/file/97066814040.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/mikonomijikibuj.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/28711446364.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/52123175866.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/wefizak.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/rofuximaxutamonif.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/lifagirun.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/zibipofapejatisali.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/88499839711.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/46949536747.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/topeziwovavopulosoxol.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/13822255061.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/sogixafidupusenegodabov.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/wajuwofolekomusoxavo.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210902_5480272402ED65F0.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/tegekaveranevuta.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/a4bd6eedcf22f54a282a638e465ded46/gibebesixajap.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/20569443346.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC1 17472 bytes
SHA-256: 0e295deefe1947aad7b93205ef0f9ae23840f12e65e4264ccbb94e3224ac86c3
font_01_sfnt_off00010ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FF 10572 bytes
SHA-256: 6e73f67daa92241c8ee6405f49d4337ef4cda754549fe1f3e40718ebcb0409e0