Malicious PDF — malware analysis report

Static analysis result for SHA-256 caab66f6f5bde124…

MALICIOUS

PDF

93.5 KB Created: 2021-09-16 12:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 61476d0e2ecd1a5af099e29c3ee126f6 SHA-1: b2eade52c484530053715ea4f8471fffc7637768 SHA-256: caab66f6f5bde1242a15c18a7d9b4850542e0115771e12f4835a767448224090
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs suggest the document is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution. The authoring application 'wkhtmltopdf' is sometimes used to generate malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://smidgel.ru/uplcv?utm_term=cheat+gta+san+andreas+mobile PDF link annotation
    • http://brainbond.ro/userfiles/file/mepewelepokisukogizenuju.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/nabelubuvepikuverikavase.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/45218224851.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/pajubij.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/butule.pdfIn PDF document text
    • http://cudicio.it/images/file/fananuxipurudijesonafof.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/gubunapimofisuxunomodu.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/fugamumuwexuvemumupix.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/metegowote.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/65520965039.pdfIn PDF document text
    • https://wittnebel.dk/file/zejedekedetetifosugivu.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/56947503311.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/43800067343.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/kewivesokegiromoremakukoz.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/kojonoz.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142deb723066---38310073266.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/xafuselumedezafe.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/jonulozenu.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/jujaxufaxikabuzalureno.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/dadago.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/96577988363.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/nonel.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16142989152d11---jilipovi.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/sivomajomuw.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_off000106aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBC 19084 bytes
SHA-256: 263485bda8726bf157ee038a3cd41341c5669d331db6dbc195ca01a980d2cbb5
font_02_sfnt_off00014ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FF2 10864 bytes
SHA-256: 2d76454be4bd257b15b9aa44066ec84be6801fc4d84aff7a6473ea553f47ff55

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