Malicious PDF — malware analysis report

Static analysis result for SHA-256 5384736eae3d2d1e…

MALICIOUS

PDF

86.6 KB Created: 2021-09-14 02:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: d06b5f30cadd0a665baffe85dcaa5fae SHA-1: f76b82ce7a0fd832e98e47fe65c790a0056fb25f SHA-256: 5384736eae3d2d1e79dfad04ea3d6c5d813b9bde278f0d0440c32bcc3c81b066
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the presence of numerous embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://mimzyonline.com/userfiles/file/83354874148.pdf In PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/modizobizotezagarawomafe.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/vinasizojozenutimasiri.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/26836292430.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/safivudedumofozaluza.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/90368618408.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/10277909843.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/supimirozojade.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/69523700819.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/29011967306.pdfIn PDF document text
    • http://195exim.com/datas/files/65126754599.pdfIn PDF document text
    • http://puisan.ru/uploads/file/12495488057.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/42546823281.pdfIn PDF document text
    • http://kdekdyjak.cz/data/41294583085.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/61893919465.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5662599432.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/83354408883.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/52722293431.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/63246765629.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091210230551.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/zerono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=best+grocery+list+app+for+androidPDF link annotation
    • 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_off0000ee44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE44 17368 bytes
SHA-256: 994a6d345739bbd41a155b7c0afcd504cc4ef342ae7d97f16aaf6aed6fa75f70
font_01_sfnt_off00011b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13372 10964 bytes
SHA-256: 20e527c24c9176ee42f83f69c56914e67b0ec976d56202c5bf5a591b2bc96657

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