Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc55c648d7822d35…

MALICIOUS

PDF

80.5 KB Created: 2021-10-04 11:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d311228ad56bb1845d109ea0dd4cd002 SHA-1: d9a46fdde564060cd2b816f6d71a1f6f9e181611 SHA-256: dc55c648d7822d3525a636408b6088027e3ce443237c2886c10a2a958de64b75
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to disposable domains and are likely part of a link farm. Heuristics indicate it's a link farm on disposable hosting, and ML and ClamAV classifiers strongly flag it as malicious, specifically as a phishing or trojan. The presence of external URIs suggests an attempt to redirect the user to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=operating+current+liabilities PDF link annotation
    • http://addisonplaza.abwingsmd.com/uploads/files/mizepav.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/35218283264.pdfIn PDF document text
    • http://balone.net/_upload/file///xuvurowedegulomarat.pdfIn PDF document text
    • https://cncunse.com/d/files/94813928350.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/sitamad.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/8654460600.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ekcpua1n0trr3h65lcu3k52rq7/92656176426.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/76169235345.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///doniruxe.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/gutejitefek.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-14/20210914064600634752.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/xufonikolulife.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/49741159672.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/luzonalajapo.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/93689106919.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/23998339350.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/fozogaw.pdfIn PDF document text
    • http://xn--80adib9cjd8a5e.xn--p1ai/i/upload/files/vaxenel.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/28640871519.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/22380474451.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/81267044261.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad4cf5f6d9---binuvejatabopadiguvon.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/nolivuf.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_off0000d445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD445 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5C 10696 bytes
SHA-256: 993819d5a3c921ac4fc5bf868ee0abd7f04c67306663ab7180e02dc4d749ec11
font_02_sfnt_off000104d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D6 18240 bytes
SHA-256: fde2dc4bb5ec92b9bbfbeedb265167c630b1bc318be5d29949debfe0e832b45d

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