Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f63f3de2996d66…

MALICIOUS

PDF

72.3 KB Created: 2021-09-23 22:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 51c5000fb2054e64549fbc44a6bba78c SHA-1: 818939853679bdd10fcc10ecd6d7cce599052613 SHA-256: f7f63f3de2996d66cda02ad6eccd127341f7c473d9a354b5111ab17e67884786
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links pointing to disposable hosting, suggesting a phishing or spam campaign. No scripts were extracted, but the presence of embedded URLs and the overall detection profile strongly suggest a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 5

  • 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.
  • 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://garglob.ru/uplcv?utm_term=how+to+download+an+app+on+my+phone PDF link annotation
    • http://doradcyprawni.com/images/pliki/likomemevuvadod.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/fuzifivawuzav.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/53299811739.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/bazujadekumideloratoremim.pdfIn PDF document text
    • https://tebra.si/userfiles/file/59030264471.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/lilanemepizuruvexowa.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/lojeti.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/safopurebiwijoge.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/nunosamu.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fda8a7f2d---59612185805.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/57355329845.pdfIn PDF document text
    • https://equimat-cheval.fr/file/saxatulobos.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/gikupan.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/lixekepewirazam.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/pevit.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/80939867717.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/dodasesamikimusibenufo.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/timiketejepa.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/juzoxulomitabimozomuwe.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/vsk5rlmm63g6pg0d45p2hvagt8/dosetuvuzo.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/62388398471.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210913155558889.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/kiledaveniwewipifop.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/tezepigenedigozufog.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/65547045710.pdfIn PDF document text
    • http://vibratingsieve.com/d/files/novewejugesomebizesevaw.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/rividiruwepoxib.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_off0000bab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB8 10488 bytes
SHA-256: d7f9d7b5effa1d3b122e02b62662e6fad130686d18d17a0752413a474922f18b
font_01_sfnt_off0000d25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25B 15980 bytes
SHA-256: 9df3b051a97e7ec91f95c48043e77430a02de6fce80934138b97c3357cdbb972
font_02_sfnt_off0000fb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1