Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57d32c1799610ba…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 19:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f2906200977e4300dc02b336045241bf SHA-1: 8bb7fb4b9d48977065ef591ab5969d4751421d19 SHA-256: c57d32c1799610baf6f65d7b3d7714f0ce9c66473221b9ee382ef53a38c6f87e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged by ClamAV as a phishing trojan. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm structure, suggesting an attempt to manipulate search engine results or distribute malicious content. While no scripts were explicitly extracted, the nature of the embedded URLs and the ML classification suggest a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://hockeydh.com/files/ups/files/besixu.pdf In PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ea50c81bc---lulusedajigevikokilatevoz.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/2779747312.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/gukosazekuna.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/7278420617.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/86898084457.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/69445982830.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/6311520613.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/5487309756.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/35841718091.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/limanazajubaxifo.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210918232632.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/21140606972.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021090511832_456152400.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/kefipebiji.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/97175623645.pdfIn PDF document text
    • http://yoron.net/up/files/66865276050.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/6044273270.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/gewifam.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/kazude.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/ludawal.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/10791388205.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/judemadazofozowisavuguzak.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/56627809124.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210915_F399A81F1C649AE4.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614760e68a426---15551894086.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=words+that+start+with+h+for+kindergartenPDF 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_off0000d955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD955 17576 bytes
SHA-256: ae232b2aba0d92f34885130be8cd078e580f9fb68ee6586b14b421f6ce59bed6
font_01_sfnt_off000106e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E1 10756 bytes
SHA-256: 1f5a465838cc46cfbb20cf528440a8e7d7d81c0bbab9dc2bb9029bdbf4fa80e0
font_02_sfnt_off00011f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1