Malicious PDF — malware analysis report

Static analysis result for SHA-256 4700c7bb2d050d51…

MALICIOUS

PDF

86.4 KB Created: 2021-09-19 20:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 661f21218027ae30245d7588406d6587 SHA-1: 985a3ea2f1ca674e13a614f64eaea277a0d7f189 SHA-256: 4700c7bb2d050d5152e54c75895edf623987b18be162f94f870d4d768c6623d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to a suspicious PDF hosted on disposable domains. The presence of multiple unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://meandnetworking.com/ckfinder/userfiles/files/dixagojokakefufasevi.pdf In PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16142233e05c30---jinovimu.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/poguledumomokifud.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/puvagizosavulaguvaw.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/51567689092.pdfIn PDF document text
    • http://vuason.vn/upload/files/konajolo.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/xebinafiperunat.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/xawojibabogufojej.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5f202fb60---buposomukolikobax.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/86995467006.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/gugekatonot.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/75560084142.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/favidipolizodij.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/neforuwipugoronin.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/31940629718.pdfIn PDF document text
    • http://kunbot.com/upload/files/23739434871.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/xaxaduvijopagoje.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/84201905277.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/jadasodugibexis.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/bijuxikalujukero.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/80937413892.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/zanaxijekipa.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/90112902767.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/22727697064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=criminal+russia+3d+gangsta+wayPDF 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_off0000ddd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD2 23936 bytes
SHA-256: db182b40a0c1213e8dcac23fceed0d857a1ff64cfd3a3f70d8005f53535c8696
font_01_sfnt_off00011adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F2 10840 bytes
SHA-256: c9eccc09f4efa3d6a05e985c264738afb5f4540a745b2c66f229dbabc49efc2e

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