Malicious PDF — malware analysis report

Static analysis result for SHA-256 d78959c195b97f26…

MALICIOUS

PDF

82.5 KB Created: 2021-09-15 18:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7ff366cbc9ffdae3ceab34df415edcbe SHA-1: 0d285a649c53c481ba1b09f38730cf183a06428f SHA-256: d78959c195b97f2611847cdfa892b5208e1a6d712a8d8d4605326bb72865c2e7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to different domains, characteristic of a link farm designed to obscure the ultimate destination and potentially distribute phishing content or malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://axi-hohenstein.de/userfiles/file/57437100091.pdf In PDF document text
    • http://www.saito-ken.jp/userdata/file/24899625458.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/noxeporubifodefuj.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/29529443152.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/54871290055.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/nojipuwatojosex.pdfIn PDF document text
    • https://brukspec.pl/upload/file/57673690212.pdfIn PDF document text
    • http://kechengchem.com/upload/files/kekonuroxofidaxanizeke.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gekijijufiteramo.pdfIn PDF document text
    • http://runhouchem.com/upload/files/buzovudamitosakometun.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-15-16-29-30-couRnJpV.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/92520240431.pdfIn PDF document text
    • http://espwireless.net/uploads/file/87302087776.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/35304969704.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/23797106769.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/75931315896.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/2852691873.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/23982086276.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/makidolaborerebaw.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c814eb4d67---numolexom.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/vofenerorigaruwuzato.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/32063767685.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/26094819966.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/42133903901.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/3f15103a6c9e0d76cef44b217564f5e3/bapovogizawitora.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=aggiornamento+android+lg+e610PDF 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_off0000da32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF249 10744 bytes
SHA-256: f1ec51017573546dbfe120a392cfa0edfe2b7eff512879d7eec9c4f05201f42f
font_02_sfnt_off00010acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACB 18652 bytes
SHA-256: 936837e3d47dd71b6e2994290ca2b8906043fae229dd645ca01274a49968af57