Malicious PDF — malware analysis report

Static analysis result for SHA-256 b084ea44c664b572…

MALICIOUS

PDF

79.4 KB Created: 2021-09-13 16:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34503d82658e2ac05e057116ad7a9ff8 SHA-1: b3ad419af9655a11c0ac31f55340c9b5cd1eef1e SHA-256: b084ea44c664b572c06dfd9da4790d1aa815b7844f2012e0cdb39a8eb14a8ec1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect the user. The ClamAV detection and ML classifier strongly suggest this is a phishing or malware delivery attempt. The presence of embedded JavaScript points to its use in exploiting PDF vulnerabilities or delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=does+iphone+read+qr+codes
    • http://wo-kop.pl/userfiles/file/81587740304.pdf
    • https://nabijdefossa.nl/upload/files/mirobefiwubigukupe.pdf
    • https://tdfstore.it/file/lukewatub.pdf
    • http://studiolorenzoni.eu/userfiles/files/fotoluzop.pdf
    • http://al-bandak.com/userfiles/file/27496962100.pdf
    • http://daglichtfilters.nl/ckfinder/userfiles/files/54270163956.pdf
    • https://www.rougeindigo.com/ckfinder/userfiles/files/zefimerugafi.pdf
    • http://helder-effect.nl/userfiles/file/fogit.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f778de93f0---98721641316.pdf
    • http://chandravanshi.com/userfiles/file/tofezijakuvonixemugo.pdf
    • https://rsebolivia.org/userfiles/file/kofikijosivunutofukaxuju.pdf
    • http://albarossa.jp/js/upload/files/kunavamavo.pdf
    • https://i-try.tw/upfile/files/2021/09/10/rotuseleduwa.pdf
    • https://lufty.cz/UserFiles/files/wuvomikazeg.pdf
    • https://www.rapn.ru/ckfinder/userfiles/files/67077791909.pdf
    • https://cv-vezouze.fr/media/file/wetilu.pdf
    • http://liily.jp/upload/file/20210903222404.pdf
    • http://gerastar.com/userfiles/file/teporigagawig.pdf
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/11458541607.pdf
    • https://eetravel.net/file/fovenazina.pdf
    • http://alianzablue.com/aym_image/files/25774359148.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec7ee23878---sagawisugarariduwoge.pdf
    • http://toyteepee.com/uploadfiles/file/210907210829061208zkfais.pdf
    • http://ingegneriarossi.it/userfiles/files/pobakalulegemazunuvosufuf.pdf
    • http://zhizhencn.com/filespath/files/20210913161705.pdf
    • http://deforma.it/userfiles/files/taleselod.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d27e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD27E 16792 bytes
font_01_sfnt_off0000ea95.bin
f44db596844cb21946de1f8e65f60b971ff89d362ffaa05f302b1a87b29dea02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA95 10612 bytes
font_02_sfnt_off00010281.bin
9b4028469396663df0a02fed5614a6bed10bd25fbd1991071af094e607629d31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10281 17724 bytes

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