Malicious PDF — malware analysis report

Static analysis result for SHA-256 deb6c3642c579072…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 10:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4fe291b0c7c794aa0d26e24a0415fea6 SHA-1: ec2a5f6d803f1542e142f3660e247d1aa1482873 SHA-256: deb6c3642c579072afee0de9fbc0ed9faa27f17882df384a4e0615d4eaa05471
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=fifty+shades+of+grey+part+2+watch+online PDF link annotation
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/fuguzekigatowida.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/37884575066.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/sikinarepogokamerivi.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/14022735345.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161418df716d3d---54671745026.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/fiwavegapipapevu.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/40267741426.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/19695960034.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/86599642252.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/babako.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/71872191588.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/60370325953.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/banap.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/tinasamamikiwovav.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/42609164905.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/62317883746.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/vijutakeroziji.pdfIn PDF document text
    • https://atavio.ru/files/file/97397587554.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/vuvujajawu.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/9935329480.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/beca366c11988fa9ca3f5c3f46f5f0cf/wogatevudo.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210904110636.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_off0000dfcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCD 17484 bytes
SHA-256: 00533b036f6a6f16f8ca0252d35efcc129913c6c75bed4064f4a00f59242a03f
font_01_sfnt_off00010d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001255d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255D 11196 bytes
SHA-256: 9848cfc09ef586a6b2478a11c1bfdf3a69293b64181a8d1186a3c880ab8d88ad

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