Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff79d55d1958d60c…

MALICIOUS

PDF

84.5 KB Created: 2021-09-23 18:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8127bc6e991758f4d1620b4e7ce66543 SHA-1: a0d8d2502505f7213a2e664887f2fe60a001a964 SHA-256: ff79d55d1958d60c8bd0f72a84ddffd07ddde27bead001af6dc88d99ea0804fe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document contains numerous links to disposable hosting, likely to obscure the true malicious destination. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://podiummoda.ru/userfiles/file/lepusawoxawaliboluvapama.pdf In PDF document text
    • http://tries.cz/media/images/upload/file/bujiwukak.pdfIn PDF document text
    • http://husplaza.hu/editor_up/wowinipexuse.pdfIn PDF document text
    • http://contua.org/userfiles/file/79271736366.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/bifavogolumafefunil.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/45eecbce0d29aee35aa198000c2aca8f/tamejofekiwituxixovogatu.pdfIn PDF document text
    • https://shioturboapi4-xyz.com/contents/files/50229191870.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/99376022298.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/89116713653.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/67546383522.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/lolawabefugonewededix.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/wakabilelezapu.pdfIn PDF document text
    • http://fitviewer.de/files/file/vemumix.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/panegugofakudetobawuli.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/71241770624.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/14860287898.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/74699493146.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/94174279652.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/bawiwukutojovolowowok.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/39305365324.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/nafot.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/labeli.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/simiwokokanepegoxuxowi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613715a5c3b84---virawetekupunaferu.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/pusolidalejigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=tap+tap+apk+pc+downloadPDF 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_off0000e411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE411 18904 bytes
SHA-256: 44f99ce995cc2be5f89a1899ff55968c24ada56d2728a0cd2a6ec213f85a11f7
font_01_sfnt_off00011500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D17 10156 bytes
SHA-256: 45466400fd6c9d37ebf9028429459ce29a077ec0968cffcedb54eda4dc0d968a