Malicious PDF — malware analysis report

Static analysis result for SHA-256 a334f5fd78834c9a…

MALICIOUS

PDF

83.2 KB Created: 2021-09-20 06:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9f2794f64295a968714d1cb37d0b343e SHA-1: b6ad2b32333c66776c53d826a4e082bc92f5cb3d SHA-256: a334f5fd78834c9a75c32b32a8a1797e9c1cdd28db9bb1b4231e74b10c238da7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics indicate the PDF acts as a link farm, directing users to multiple disposable domains, one of which is `https://allytemp.ru/uplcv`. This suggests a phishing or malware distribution attempt, likely using the document as a lure for users seeking specific content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=strength+of+materials+hibbeler+solutions+manual PDF link annotation
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/xalezupixi.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109072301434736.pdfIn PDF document text
    • https://webmenuplus.com/images/file/1404235043.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/rolobewusedor.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/35714467975.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/lasegedawod.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/wogilakikesafo.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/40674538699.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/wixufalalo.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/potumemuziniwe.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/tadevasunar.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/98154474947.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/nilulejedonuvibu.pdfIn PDF document text
    • http://candientushinko.com/images/file/zegunojowixe.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/sumijim.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/74052224835.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ampuk3455u9q0frtr4si86ter6/lofisewajawopugew.pdfIn PDF document text
    • https://remini.hu/userfiles/file/55227234226.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/91583287846.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210916214219.pdfIn PDF document text
    • http://land89.com/ckupload/files/regigot.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/6141a7a0ad47b.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/pavubimexadamekadodawuwol.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613448942b2e9---87377379345.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_off0000dd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD81 18324 bytes
SHA-256: 702dd04830e8c6e0b39e4f3888b0878b39ed1e4abd5fb5c2ef5ee2dc39316501
font_01_sfnt_off00010d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12555 10976 bytes
SHA-256: cfa93e02a4f78339ceb41e2037e1d3bcf80754a00eabe3bf9bc6cfd6e6e12e70

Open this report in the interactive analyzer, or submit your own file for analysis.