Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b2decbd45b684dd…

MALICIOUS

PDF

76.2 KB Created: 2021-09-21 07:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d47d35531bf9c4e4f84efb4f315d566f SHA-1: 9cd134f2d87ff46210e20e2aaf982ba3840e1db5 SHA-256: 6b2decbd45b684dd5fe9d7c17b6043cb76115ab7018607dc2d28230b76eb03ab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains embedded URLs, one of which is presented as a lure for 'utorrent pro for android' downloads. The PDF structure and embedded links suggest an attempt to redirect users to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613203f03e021---42093503055.pdf In PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/xuziwakuziwisomogof.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/fonibix.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/1839884041614899ad73bb1.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/joronerezonekogiguxo.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/82995647574.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/50658341447.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/51569329116.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/povifane.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/92328679502.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/zajalix.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/watoxikomukil.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/38884022495.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/1346917361.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/83935159288.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/devowobawedi.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/lidaligapoweginevuwip.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/nodumufelogej.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/37100886469.pdfIn PDF document text
    • https://yakin-surewin.com/media/file/76941089871.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=utorrent+pro+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_off0000c74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74E 17340 bytes
SHA-256: 26c9aeda96e810e230771bdd49dcb1fcb71f6346f228b5bfa05dbe5fd0bb2c09
font_01_sfnt_off0000f426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF426 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3D 10284 bytes
SHA-256: b3227900324182eb6cd1907b5d9ccdf98e023e3386569c1b28520b75f634106a

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