Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1928f10c3653c62…

MALICIOUS

PDF

83.4 KB Created: 2021-10-07 02:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4593937dd021742faedac936823210a7 SHA-1: e70967b7b6c3bad2628702e984fac85adbb0d914 SHA-256: b1928f10c3653c6200468b539537dcf0017a7b7ba46f65ca625310cfcaebbb55
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains or are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://krisoc.ru/uplcv?utm_term=pokemon+sun+and+moon+ultra+legends+episode+45+in+english PDF link annotation
    • http://gutachterbewertung.de/userfiles/file/mubipivefudatuxewolosox.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/diluxu.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161588d8b12e7a---25136978359.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/t8qq61r75p6fbjiash2dc633ei/totoxagaveralutovojaduru.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/bekekuno.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/bodedugafenulabur.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/12957690201.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/xokipusekazum.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/jaletupuxefigaxipiwulub.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109261010176953.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/31592370770.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/dulik.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/80116303613.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/5262883672.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/29141356905.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/wavinetulariloniraf.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/98488259295.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/9380189702.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe8475eeb8---4354773327.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_off0000d36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36B 11244 bytes
SHA-256: 8a3e82665f7f496ca776fbc8bd6fd2d30e2ca2936eb39d4345daa0336c1251b8
font_01_sfnt_off0000ed72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED72 22764 bytes
SHA-256: 307ef428b376211499fe9c2a51d787ee193095383c00287b15b629dac65e71fc
font_02_sfnt_off00012838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12838 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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