Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da378ad93cd1f0c…

MALICIOUS

PDF

76.9 KB Created: 2021-09-20 12:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9172fd03ca3dc9e1b7cf3db3d99b37f5 SHA-1: 176f709b8069f610ed4ffac7dbf0fa724214df64 SHA-256: 9da378ad93cd1f0c8345f32d0ecf171f1bcf9220ff250783a4f4103ea2cf69c2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing campaign. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=page+monitor+chrome+android PDF link annotation
    • http://t-eamplus.de/web/editor/files/85408778595.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/dobasozapazozajukudizivid.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/nigifa.pdfIn PDF document text
    • https://securitydm.com/slicice/file/20381425080.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/28440177708.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/jejugumajopu.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/rorewitapomaxu.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/12464467921.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/29267261738.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/45986ecdb6d2808102335fd3f4ee8a2d/43605918525.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/fawaxetalanisimatekap.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/wogumijeb.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/40452443540.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/gazofixigatomosevomofa.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/89916420573.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/nizodoliv.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/wizemifazofur.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/81967673827.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///lezujemomemolifibifag.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/49969626258.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/laliburod.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/padujewinoxazapinelunan.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/67654130126.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/rakozulopo.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_off0000c795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC795 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA7 17512 bytes
SHA-256: 60b91188c86f2d66f28725064f546338347f9abe23bcc7c670e88402c1326f3d
font_02_sfnt_off00010d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D96 10604 bytes
SHA-256: 24e783c625112996d495cddb922c9c0148510865849ccc355716ff90b7ec9079

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