Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d850567ec28910…

MALICIOUS

PDF

76.1 KB Created: 2021-09-17 02:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 26af5885fbe764386ad89f2d63f75e32 SHA-1: 4b60f4563b465f4b372e24e7e7978425f6feca0e SHA-256: a6d850567ec28910ed5d4e2a693fc3fbb220422511650c16ff6fdadea928073b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or distributing further malware. The PDF structure and embedded content suggest it's part of a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://oniceh.ru/uplcv?utm_term=pes+compressed+for+android PDF link annotation
    • https://immsac.pe/sgi_userfiles/userfiles/files/89158967338.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/98047137649.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-17/3cd2c70052b3b5792a835d23d6c46d24.pdfIn PDF document text
    • http://satyamtracparts.com/userfiles/file/nugejifojowanosifagiz.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7b910e185---5225559841.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/xefadabetuvagazilugaxaru.pdfIn PDF document text
    • http://hangquangauto.com/files/ropivinonur.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/70703929095.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/17702116729.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/3714164771.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/63824091853.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/95386434706.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/94079926497.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/dumeninasafaju.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/32725706677.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/bojotili.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_off0000c5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CC 17616 bytes
SHA-256: 41c9b2c03f84f615d76aa694dfcd9d0e473658a8342b34132de497d52193af6d
font_01_sfnt_off0000f352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF352 10636 bytes
SHA-256: b08aeed3e414270b5337b2319e1fdd7d0cf5a17f3994acc202ee6f92b431aa7d
font_02_sfnt_off00010ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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