Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57992566df4436f…

MALICIOUS

PDF

80.2 KB Created: 2021-10-05 02:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0891e41b4522d5b184dd9c0eee16de24 SHA-1: 57f41e9258372c33c526fa8fb517f1ff5e1ea5e6 SHA-256: a57992566df4436f62cb943ad7be5875acd62017b001dd2d22ef27818ff2b6ad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external domains, many of which appear to be part of link farms or disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded URIs indicate a likely spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=the+large+vessels+that+return+blood+to+the+heart+are+called PDF link annotation
    • https://33mobility.net/uploads/files/37718433327.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cfabbf11e---55024181080.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/fawovufazikoxabedogikugav.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143eb5256eff---rebimixoba.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/52138508680.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/bupilofupedifimi.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/gobimanerurusula.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/84307394781.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/dozubodonutawon.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/82606873018.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/sufegewo.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/fozas.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/90975246542.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/felazeliratuzatukekoxek.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/nunozosununudokagesima.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///zatefomepawobiguxunezer.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/zerilimis.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/xuverepiwixowawe.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/kumamekezolumemelono.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/92950588967.pdfIn PDF document text
    • https://dintek.eu/uploads/file/kejagamigusowu.pdfIn PDF document text
    • 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_off0000d3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A1 17844 bytes
SHA-256: a0a403db8f02aac358179d88a1efa96ff27a05e17d48f10a94492968b56806d1
font_01_sfnt_off00010204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10204 10828 bytes
SHA-256: 0cf37ced04ece68f632a639f4dd82a9ff0dbcc74c7ea956dd244b4de9b7ac3cb
font_02_sfnt_off00011acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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