Malicious PDF — malware analysis report

Static analysis result for SHA-256 6465be4d1e1d361e…

MALICIOUS

PDF

78.3 KB Created: 2021-09-16 17:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e245b1d83683efac1701e0eaeb27e2e3 SHA-1: 9964b589a41030906c677a317e540fdceb9fd9f7 SHA-256: 6465be4d1e1d361eafc8d29409f75966a6dd1505bd73bdfc4dc828148077cfca
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs that point to a link farm, suggesting an attempt to redirect users to malicious websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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.
  • 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://evo-models.com/uploads/userfiles/files/17392518995.pdf In PDF document text
    • http://jingyilin.org/uploads/file/54225418999.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/zekudemefivu.pdfIn PDF document text
    • http://principesgs.com/userfiles/file/wufalejorixobipoxevefix.pdfIn PDF document text
    • http://www.pilartangguh.com/file/ponifowasimigizu.pdfIn PDF document text
    • https://artenika.pl/fck/file/12718655056.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kituz.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/39900100453.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/lemamezunozimanepos.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/fimagibinasejowabuzawokoz.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/baruvesurajojire.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210910010915.pdfIn PDF document text
    • https://inks.bg/userfiles/file/61123794294.pdfIn PDF document text
    • http://flirdining.com/uploads/files/xixub.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/bopafigadozajekewomogovaf.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/9994632976.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/55252777824.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/152104053.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/53538754691.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/6699737437.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a36af25861---93428514226.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/pgv07imv272old9tl7jnu2mhi0/52022828464.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/nifaru.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/masitakibitomedukazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=my+hero+academia+full+movie+english+dubPDF 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_off0000ca6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6C 18156 bytes
SHA-256: f8b5140190a35886dedf483444e55e97329468fa1c59eaa73672887df2db9044
font_01_sfnt_off0000f9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C6 11236 bytes
SHA-256: 2f51a07fa2a40ad0f9600148dd90232df678543af8c2361a8b7d449c7aa1d1ec

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