Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04b3c90b6e3e740…

MALICIOUS

PDF

71.4 KB Created: 2021-09-19 07:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9ca20e09c7413951531db56182056649 SHA-1: 8adb1cc6f60629fba4fdf62220b920672b0527d6 SHA-256: a04b3c90b6e3e740a280dfd02ed695aa632342912f85a473bc6e06731a7820a5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://mitrasuksesku.com/userfiles/file/diroju.pdf In PDF document text
    • http://mvdeastudio.it/userfiles/files/xejubegofez.pdfIn PDF document text
    • https://merlak.ru/userfiles/file/41483725181.pdfIn PDF document text
    • http://maihome.hu/admin1/file/97115813180.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/3711806907.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/gufomemawimameravadinol.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161421e8047f57---sijenikodawigilove.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210914143521.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/k91deb40ftfok7d182nv56i5rf/rokaxisumizezilesejipe.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/talokefod.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/dejurip.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210911192408.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/lejupe.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1631274657.pdfIn PDF document text
    • https://ibericadearmerias.com/file/56168109084.pdfIn PDF document text
    • http://vrzion.com/data/userfiles/files/65486237143.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/61977978012.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/wazorajovovafojinibag.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/34854383295.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/44115799465.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=hack+trick+8+ball+poolPDF link annotation
    • https://b2cdemo.tickets.com/content/files/fenomolopumorow.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_off0000b786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB786 16128 bytes
SHA-256: a09a35eb28456dbdff3e233ea0fe629a74d09a755e15bb1c0c83fd35112b8221
font_01_sfnt_off0000e09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B4 10396 bytes
SHA-256: 982f62c272fad69c51dbf07de6240123548d7dab14286dde017d00f79f5c7cc6

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