Malicious PDF — malware analysis report

Static analysis result for SHA-256 899f623a562a72bb…

MALICIOUS

PDF

70.2 KB Created: 2021-09-28 18:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2afb6c99d09a52b1fb1c308f40403395 SHA-1: 24716e30a4f1b5865cbd2272cb5a5f4ec1654556 SHA-256: 899f623a562a72bbf20d477395ab7c3a8c486a0686a996d3232cb94f53a4a915
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically calls out this behavior, and the presence of external URIs further supports this. While no scripts were explicitly extracted, the PDF structure and numerous links suggest it's designed to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=which+is+the+best+camera+app+for+android+phone PDF link annotation
    • http://dansungsala.com/uploads/files/51309772117.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/bisorivoxew.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/mutabu.pdfIn PDF document text
    • http://salkim.com/userfiles/file/natojuxukefunababojibot.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/83367129264.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/89569663074.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/5907185229.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021913519343752.pdfIn PDF document text
    • http://dolgoprudnyj.inhome360.ru/admin/ckfinder/userfiles/files/nexiguwasuwujifulinukub.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/f1852a99be96e75a37444358194af33c/rinawalideto.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/38000462277.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/34612694748.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/tojopew.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/78575323259.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/j1gmqu6ui31jn6apmhvc00r5nr/vikadibowejapitav.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/35602130392.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/21680666032.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/okepivurere.pdfIn PDF document text
    • https://kawanmto.net/contents/files/kenimigidazibagodo.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/31596252408.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/31393733681.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/83908890029.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/41714662503.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/wasuwekulerimipibubovo.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_off0000b115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB115 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92C 10972 bytes
SHA-256: b20b52dc2f300cc1cceca4cd476941c122f36b3cc8867027ab6e33d68578b510
font_02_sfnt_off0000e23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23E 15880 bytes
SHA-256: 10d0c74ba3a533d7c261eeea92fa3f3eff1ddb94cb46b289757adc5cecea5a70

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