Malicious PDF — malware analysis report

Static analysis result for SHA-256 1196ba51457f84c9…

MALICIOUS

PDF

81.9 KB Created: 2021-09-09 11:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 00b650d3f2567409c779bf85b7a97483 SHA-1: df868e44874628a49ebb7b650bc3eb5f830081ca SHA-256: 1196ba51457f84c9009403f224791a0230d82b76050d3c555d15aadc51d7b3f1
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 pointing to external PDF files, suggesting a link farm or redirection mechanism to distribute further malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags the sample as a link farm on disposable hosting, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://digireg.it/upload/zapegalab.pdf In PDF document text
    • https://nordavril.com/userfiles/file/xurinemuxodofatofabafow.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/wogopizomuti.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/63548850961.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53621960420.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/62987756839.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/5328566043.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/9589993924.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/76483478521.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/57032360984.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/zezozo.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210905021641.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/zogujubisa.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/golaxukubif.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bce35745f---86737008637.pdfIn PDF document text
    • https://elemonbg.com/Files/File/19426374365.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/36691504057.pdfIn PDF document text
    • https://masukpt2.com/contents/files/30307725108.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/xumudanobaduwozu.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/94618350415.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/letek.pdfIn PDF document text
    • http://fxlcd.com/upload/file/tisegepe.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/49738008221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=13+steps+to+mentalism+free+pdf+downloadPDF 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_off0000da02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF219 10872 bytes
SHA-256: 7c717b6609b997f11ac4dc23fd83533242eca5adea2c1b6baa9bd6040adaa90c
font_02_sfnt_off00010b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B41 17724 bytes
SHA-256: a2a1917764d2140e8d3cdcde1fc506460d2376ea95169a934057b010c4e8c596

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