Malicious PDF — malware analysis report

Static analysis result for SHA-256 09cc3e3c4d17ec95…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 05:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ff4ba8d86136f43c7ef902359ea39a65 SHA-1: 073cae07f01b1ed699595d9f65cffa0276b5d38f SHA-256: 09cc3e3c4d17ec9548001aae342deb949c3784762fe2e3bf68c4d94591d81b53
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects to external URLs, as suggested by the numerous PDF_URI and EMBEDDED_URL heuristics, which are often used for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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 http://guojingmall.com/userfiles/file///33433712058.pdf In PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/voguludojujimovewonusab.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/77953825492.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/vemibaredewarofafekig.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/68584208410.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/64391989850.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/wakaw.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/81512475874.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/vusir.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/pizufofoxanewulenuvo.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613189815e4d3---79241060277.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/29630068258.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/67200694765.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/piwopapozenak.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a80a1bfcc5---79705884135.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bokegikefevojoga.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/52269052149.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/15310330895.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/77020928128.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/34671499926.pdfIn PDF document text
    • http://prota.ru/upload/files/subaxo.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/47765919474.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/4083567536.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/22114802189.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=panic+room+watch+onlinePDF 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_off0000dadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADB 10412 bytes
SHA-256: 4d4550627cbb0c889bc766e70720974af67106f52018b149cdf9d01a08a8c83e
font_01_sfnt_off0000f249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF249 18016 bytes
SHA-256: 93e673ee3ffa5fe4b764088d500504d43a911e15096ee92aed81619973f447e2
font_02_sfnt_off00012103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12103 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1