Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6703b25aa6b529…

MALICIOUS

PDF

77.1 KB Created: 2021-09-21 02:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2080b5da9d594531aa96c85fe1873a1f SHA-1: 341034d29ff63c2e4d119dcb6736955a0b811eaa SHA-256: 5a6703b25aa6b529e524917ad0cd1c86292c8b2b76c046a4d244db36f1f0430f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=how+to+block+unknown+callers+on+lg+phone PDF link annotation
    • https://ladulceseguros.ar/noticias/fckeditor/file/49467486973.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/9845238927.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/90391022926.pdfIn PDF document text
    • http://servmed.net/userfiles/file/kukiwitefu.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/torilosofilo.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/9402904309.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/vesutugukerewujuxovu.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e584689c77---61582201612.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/xalugebedevixobeniv.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/84237032692.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/jozefipelu.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/jozuviwotikatibuk.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/53065326472.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/jenuwawepirerunama.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/susizemoxenatiworaram.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/lovosimorikodupijomi.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/wowisalaroligidenim.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/kutimibasixajadozalaj.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-19/20210919215526233308.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/93289584608.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/gizobovitulerobej.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_off0000c6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AB 17872 bytes
SHA-256: 868e7b1d0bdd54ddcbc2a3d6ec76b4c290bed66e76c689407a3942b844109f1f
font_01_sfnt_off0000f4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D04 10968 bytes
SHA-256: dc377e5e9826485d34cf26048c632fa99ea1ddeb1af17dd66985574fbf71a2fd

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