Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83aaca557bfa1c5…

MALICIOUS

PDF

86.0 KB Created: 2021-09-19 00:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3a47f5cbbb58658f491b572a165a8f26 SHA-1: 0a8e0ce5ba59786b59b6c41e5b5bd4ae8690393a SHA-256: c83aaca557bfa1c5091f7ed87427c8b2ece6ca8f32077a00835984e55ff75e0d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The presence of numerous external URLs, many pointing to PDF files on various domains, suggests an attempt to distribute or redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://haiannweb.com/uploads/files/57490179753.pdf In PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/supigew.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/36893725639.pdfIn PDF document text
    • http://generoussecurity.com/uploads/dudubon.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/41093584528.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/9353222126.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/8675719384.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/95097935329.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/danebugomonerapituropef.pdfIn PDF document text
    • http://njxinbell.com/upload/files/92589587125.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/jekejugupomim.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/dateriwojowejadometofuw.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140da472d7e0---28038967748.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/fuvilofejonabe.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210908171735.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/20229335641.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/90262291262.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/57399276540.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/926a67lc185k543u97j484gtp3/40670187155.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/38300341290.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/31110601419.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=snake+download+apkPDF link annotation
    • 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_off0000e847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE847 20052 bytes
SHA-256: 3579a0c4a06f455a8e5c1853e5396093fa931dfc52d019f95579cea448b0044b
font_01_sfnt_off00011bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133EF 10180 bytes
SHA-256: 59d38e15fa7bccd64b1be15d2ff381951f477e749e0e4ab1afb626df67365d1a

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