Malicious PDF — malware analysis report

Static analysis result for SHA-256 abb9ec70532ae81c…

MALICIOUS

PDF

75.7 KB Created: 2021-09-13 12:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 39ceae3d7f653d49c00ab280a7cd4f8a SHA-1: bb6e16bb368aad3b428263fa593218fee8cc1620 SHA-256: abb9ec70532ae81cfb6f5e9d0186115d792369f9576b9458c804c0cf25024338
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm and potentially malicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://eis-pieschel.de/UserFiles/File/vegalugajoxon.pdf In PDF document text
    • https://pielinks.com/UserFiles/file/37870320370.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/lideruti.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/papigujoka.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/tasikadoga.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/foxolutokisufefidom.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/53806189819.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/26087340838.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6155a3464---jugawidikuforinupiwe.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/wijugirisuwovefojebivevu.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/8853884352.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/kobawefadaresageline.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/penos.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///nagufedu.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/fakikifir.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/disuvotim.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/64141082076.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210910110520118.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/zetajano.pdfIn PDF document text
    • http://vswet.ru/f/ganawatoxapavaponapop.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109081433221291.pdfIn PDF document text
    • http://unityproductions.com/upload/files/73163116530.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/7e31b75a472193b1dbd015fc4f37a9ed/tavelovebobasonunukitin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=download+jelly+bean+versionPDF 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_off0000c275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA87 17880 bytes
SHA-256: 4fc119202b02c9cd89cb5f089efd83d1f1a00c3ff421924ff237d0f40459d215
font_02_sfnt_off000108f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F5 10680 bytes
SHA-256: 94c2b6572d49447b31bd3555875ee9531a5931166354d8fd3d7021d0b0f02b55

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