Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f13537f6b0efe59…

MALICIOUS

PDF

78.1 KB Created: 2021-09-18 10:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c81c90b14b3b9c8b34c79c8f376755b5 SHA-1: 6d65108d133893a724d3906959ccdf12a4d5f74e SHA-256: 1f13537f6b0efe59a8856c84e28614045c40b0b20a667feba5638c4a9b793d05
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 disposable domains, suggests a phishing or link-farming scheme. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware distribution or credential harvesting campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://prawobrzeze.info/userfiles/file/zixesetubijokafijaz.pdf In PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/narelorutiz.pdfIn PDF document text
    • https://mikludava.lt/images/files/54031122810.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/62197103351.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/36539478822.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/posurififololobezita.pdfIn PDF document text
    • http://ux-school.ru/files/files/kaxazejeluma.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/36127200671.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/53355603513.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/zosorupag.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/fonovujijuwifoxovimujiji.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/47093238210.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/50338432444.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/vanisalofobasow.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/11774565938.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/kebajujekanusoba.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/funiruwidi.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/zenekiwizosi.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/25349672435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=free+fire+nico+app+downloadPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/buradebuzofivitupogiwo.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_off0000ce9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9C 10408 bytes
SHA-256: f2a5f62f6343f4b6576f66cedd19458706acd8af5c3a8bdec54f7ef9d912e80b
font_01_sfnt_off0000e63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63D 17112 bytes
SHA-256: fc00a63396a94a84f8c86b3a7820e86ea693be747dda0321aa91b6e87fd8af8a
font_02_sfnt_off000112cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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