Malicious PDF — malware analysis report

Static analysis result for SHA-256 9080e440ce2487ff…

MALICIOUS

PDF

79.1 KB Created: 2021-09-10 15:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b2e8c49d2e34c664d5503174f93f176 SHA-1: efcda0ceeb623366a6483cbf28d8f187dcce556c SHA-256: 9080e440ce2487ffa15a64f9e93d7513df09f35a84099d1ad1c9f779ea74c8b0
126 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the interpretation that these links are part of a malicious campaign, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://animalscipublisher.com/files/upfiles/file/67865605005.pdf
    • http://dichvugiayphep.biz/upload/ck/files/gidavekikexekikunap.pdf
    • https://rajatotogroup4.com/contents/files/47877371876.pdf
    • https://alicantea.centralcms.cloud/galeria/files/32712570027.pdf
    • http://hajnysport.cz/FCK_userfiles/file/nodifesamuxusadavumim.pdf
    • https://alshuka.ps/ckfinder/userfiles/files/norikibanipenele.pdf
    • https://guineaservicesproviders.com/gsp/files/59300772034.pdf
    • http://ucokampen.com/media/files/64199450232.pdf
    • https://umiyawoodworks.com/fckdb/userfiles/file/24528796953.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134ea54b14c3---63750078937.pdf
    • http://bftt.marketsearching.com/upload/files/42861642551.pdf
    • http://rszm88.com/upfolder/e/files/20210903055353.pdf
    • http://1-champagne.com/blog_images/blog_/file/34585883048.pdf
    • https://cortopolis.ar/userfiles/file/21991751460.pdf
    • http://carrozzeriabosini.net/userfiles/files/44955583682.pdf
    • https://xn--fiqa735be48e.com/upload/files/46249100813.pdf
    • https://soudurelauziere.ca/upload/editor/file/fipowutapanumupomomisuzi.pdf
    • http://zatexpress.com/upload/userfiles/files/joposajivaxiwudamivus.pdf
    • http://hoachattn.com/image/files/rapum.pdf
    • http://perfect-gallery.com/userfiles/file/80472888083.pdf
    • http://jin16888.com/userfiles/file/78063848303.pdf
    • http://goddesshair.net/upload/users/files/fozaku.pdf
    • https://bucatariizidite.ro/printuri-fi/files/34317101702.pdf
    • https://doctmcooper.com/userfiles/files/57555572482.pdf
    • http://petra-koparki.pl/Upload/file/9198810852.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=bloxburg+garden+house
    • 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_off0000d042.bin
2e606407234e8a72558b6ab5d708881fa4f57cefeebaea9c97d672bc1251f869		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD042 17968 bytes
font_01_sfnt_off0000fe94.bin
0a0dd42af4dc72481ba7d04e20e03149e924d83700658af23625a4530b192650		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE94 10732 bytes
font_02_sfnt_off00011705.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11705 16792 bytes

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