Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b37cf400e85f58…

MALICIOUS

PDF

83.0 KB Created: 2021-09-15 18:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a04fed1a1a41847be81cd69da13eb2a3 SHA-1: b7edee26a9fa80607f4579af4f3ef999ca136770 SHA-256: 09b37cf400e85f581bfa3fd3c6e5303da81559c5db2d4765eb7ddfc4c9b88bd2
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 4

  • 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://quangcaosms.org/media/ftp/file/85722951295.pdf In PDF document text
    • http://sanchariglobal.com/userfiles/file/gepikodevodozolezeke.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/52549390211.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/49197094024.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/lixorikanan.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d26aafd52---ziwoxeduxafe.pdfIn PDF document text
    • https://actor-conseil.com/files/file/tupiluzukatobem.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/janoxefetunuzozem.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/dasutuvewuz.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210911_0E593FCFBA88DDE7.pdfIn PDF document text
    • http://sapthagireesyathra.com/userfiles/file/13003813697.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fbac6e840---jojitivojifuv.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/41977998485.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/dizuvifix.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/kijeriwiwotasepujaxe.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/35354040679.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/xuzavitevekigitexi.pdfIn PDF document text
    • http://iphysiology.ru/upload/tedizof.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/gakadiwojelegi.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/10609484333.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210908_095440_142.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/4443848793.pdfIn PDF document text
    • https://adikkedua.com/contents/files/41457998664.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=call+hide+app+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_off0000df39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74B 18596 bytes
SHA-256: f3b449c22a72294a227da8ba958ca187e64b404a2413b79af4d226e02ec43199
font_02_sfnt_off00012779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12779 10240 bytes
SHA-256: 16b89a83aecc00f3999173607f55c992ab80ef6fea90a634afde0c038a9f986d

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