Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1bb1813ffaf07bb…

MALICIOUS

PDF

87.0 KB Created: 2021-09-25 01:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ad06892daf2d9b607e8b3741ab33dcc8 SHA-1: 33383e6292820985d0cbbf9c3f43976668f3969f SHA-256: d1bb1813ffaf07bb35790677b377f4f128a5620df4245b0572a149736019bbd0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to potentially disposable domains, suggests a link farm or phishing lure. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which could be used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://medvor.ru/uplcv?utm_term=sk%C4%85d+pobra%C4%87+minecraft+na+androida PDF link annotation
    • https://triatlonshop.cz/userfiles/file/lojeluzudumokulu.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/20879275739.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/79703047393.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/ditazikepej.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/3410466287.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/30733038968.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/41994138567.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/fotezitagexefe.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/warijovufatubenu.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/manarisewute.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/32066053621.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/62660597092.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/67752858934.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/98671778476.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/jutakewudugopesutus.pdfIn PDF document text
    • http://teraval.cz/res/file/zirokod.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16132367b21271---36304657318.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/40906592097.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/juvalezonixolupufenipibad.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/66564207560.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/94504756952.pdfIn PDF document text
    • http://asqcert.net/files/files/pugixiwixilatovagigo.pdfIn PDF document text
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/31293148530.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_off0000ed13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED13 18188 bytes
SHA-256: ec56b49f6ebe20e962da5ae7e7c1dcf1b8c084510e933caada9d8fe62f6723a5
font_01_sfnt_off00011b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001333a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333A 11248 bytes
SHA-256: 4feb9c7a556705598c205b0f010b2a8ea65da1565036ed31a7f54ad813dd73d3

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