Malicious PDF — malware analysis report

Static analysis result for SHA-256 7846ccc0230c5954…

MALICIOUS

PDF

82.2 KB Created: 2021-09-10 23:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4e608bd8898e2ac309d2258d8df519af SHA-1: b731963b7ab54f9e88dc1c01c5137646113f6cc9 SHA-256: 7846ccc0230c59546ce2ac956f8e2501840c9c7bb8caa25380c61d6ed7241fae
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirm the document's purpose is to redirect users to potentially malicious content, likely for phishing or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=cities+skylines+which+map+to+start PDF link annotation
    • https://vietrocknet.org/app/webroot/img/files/lepuges.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/lofesoxiwepebodafofewisiv.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/wiwekewewi.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/89509233506.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/nuvonikadaxipapetitil.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/43081672313.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/79188061312.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210904_202337.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/gozagenisokid.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/91450812767.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/42241851257.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/ridarug.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/ubdv3rk8f4gssqv2pp2joaat9s/25643980428.pdfIn PDF document text
    • http://furniture83.com/upload/files/zipevizotosalitoxojemafo.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/vanuroxiditatotiwo.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210904_171751.pdfIn PDF document text
    • https://seger.cz/userfiles/file/22150936843.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/28320728173.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/38937059164.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613022d627f5b---75273777074.pdfIn PDF document text
    • https://satesayap.com/contents/files/xevemujan.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sijigira.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_off0000ded5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E7 16860 bytes
SHA-256: 5602b038f58466d7218ed065836b41314826998763465499a07c64f88c690aa0
font_02_sfnt_off0001226f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226F 10960 bytes
SHA-256: 3a19dd1ba931f8cb63a8a89e978665e2b88861d4c16fef6e8db93bd1d5c0d66e

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