Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0792659b031ed5e…

MALICIOUS

PDF

71.3 KB Created: 2021-10-07 16:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4e2616678cddad5429c7ed1d71f64320 SHA-1: b9495664edb3537d0ad5331b72d98de7fe03cf77 SHA-256: c0792659b031ed5e8327066838cdc8388562a86a47b4995625d3f08ad36965a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. It contains numerous embedded URLs, with one pointing to a suspicious domain ('crysiq.ru') that appears to be part of a link farm. The PDF structure itself is also indicative of malicious intent, being a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://crysiq.ru/uplcv?utm_term=meaning+of+angels+ascending+and+descending PDF link annotation
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1615087cc559d3---ginoda.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/63753950014.pdfIn PDF document text
    • http://ellev.fr/upload/files/suvegivaj.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/dikodez.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109050214461155.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/kinefinixipu.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/51223276872.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/jaxunojixiv.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/62677446259.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/81400922379.pdfIn PDF document text
    • http://geraldinekilkelly.ie/17726657179.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/36027116549.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/96025766817.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202110032235104044.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/naxogatezawumaxafor.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/47457661316.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wuvupivatefuturoz.pdfIn PDF document text
    • http://agavietnam.com/img/files/92895849941.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021107180285146.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/32050976955.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/89462519025.pdfIn PDF document text
    • https://b2cdemo.tickets.com/content/files/53993236032.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_off0000b485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB485 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC97 16956 bytes
SHA-256: e736208b380d9b2ad02c9da72fe44a6481450647d868bd479908bfff4438247f
font_02_sfnt_off0000f7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C3 10448 bytes
SHA-256: 2c157025b1fe868d14eaab069a24dda7bc0974eae96e5eb598d0c47cd75e370e

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