Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd5c1b59b03df06a…

MALICIOUS

PDF

86.0 KB Created: 2021-09-08 21:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f6fc0d110afeb3aaf1e2710f7cb8984a SHA-1: be4170f5ef9b7a45fb103edb865f78ec15408219 SHA-256: fd5c1b59b03df06a6d117d7a6a22767c3776148f0da2a17e3b863d17f7468d1b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to distribute or redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://sirmamedia.com/ckfinder/userfiles/files/ruxidedobavawiwot.pdf In PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/fesitefodududisejodi.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/sebovoz.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/48104967459.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/21383354085.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/pogesofodokojopisoso.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/1279545887.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/tuzediwesevo.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/77897844968.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/gegixogumarevagu.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/68052874315.pdfIn PDF document text
    • http://fruitvita.com/files/files/xufagonofekidomikus.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/12370076728.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/maxis.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/kdv2c1kincpvjnn947p7h7lm46/89287483814.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/92684007197.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/luwakoninujizotidutareni.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/56626855689.pdfIn PDF document text
    • http://atrsara.ir/resource/files/31353084839.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/42274107905.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1612f730c26909---muzobanarumom.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/99665226947.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/kabinebexexatosapuminefen.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/buzopogimamunenugidem.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/jatukaperif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=infinitive+worksheet+high+schoolPDF 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_off0000e7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10009 18344 bytes
SHA-256: 6260f829526e3cbe450c23c92dd84eb473397b5c377e25b52ebc3b002404c4f1
font_02_sfnt_off00012fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD7 10648 bytes
SHA-256: dfd77362f84b0e21667ccc3595b5e4edda526bc2cb8ed7901001d71b88017851