Malicious PDF — malware analysis report

Static analysis result for SHA-256 7746fdf02bd5ad04…

MALICIOUS

PDF

68.9 KB Created: 2021-09-18 09:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 15cdd30b8d7bd410565b66620031bcb0 SHA-1: 327d4426f50ae4a8c930f333124923eac5bff1d1 SHA-256: 7746fdf02bd5ad04fe7f5fe2e51db3bc1122ba04c81add2f7b253af25909228a
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious intent, including random and disposable URLs, and a critical ClamAV detection for a phishing trojan. The ML classifier also strongly flagged the PDF as malicious. The presence of embedded links suggests a phishing or credential harvesting attempt, or a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://philabc.ru/uplcv?utm_term=crop+image+android+studio PDF link annotation
    • https://lrsinc.co/userfiles/file/mebafoveva.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/ruzetafetokilixilozimu.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/zajivinaba.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/xesuruxosalomuvefowew.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/taseruvigov.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/e9676a7170784b1957f176fba006ed3c/bexasofakuzomi.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/80207054809.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/nikepuzazux.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/piraxuma.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/65971189321.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/89881424300.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/wexasivexilijibekezogora.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/wurawobesaxexetut.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/kusirubizuwibosujo.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/6303054162.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/disagegogaterekopujurur.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16131778e939b9---29845448526.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/56553849428.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/49867513225.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/liwojemofazir.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/ripijefutos.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-09-20-31-45-40.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/66343526708.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_off0000b06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB06B 10820 bytes
SHA-256: c5fe51223381fa26616a490a79797aa0f0210e4afa0e2babe1eeaebed590a83e
font_01_sfnt_off0000c92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE141 14772 bytes
SHA-256: c59b77114c3cb71e1352471f2653d29cdf4e596dc82784c63f6803f1416a7ec6