Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b3eb3cedf3149f9…

MALICIOUS

PDF

72.5 KB Created: 2021-09-28 02:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e1d9aeb93ce12cea9f84b86c0cc84466 SHA-1: 42e9dd12cf425b36b7a4faa95517541bfc5a5c9a SHA-256: 0b3eb3cedf3149f9e238e5eaeac91ca3dfdca1248aa99c5becf537a7a7435496
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 trojan. Heuristics indicate it functions as a link farm with numerous external URIs, many hosted on potentially disposable domains. The primary purpose appears to be directing users to malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/aa53e82773bbb781b246112b4802fe58/84403569864.pdf In PDF document text
    • https://quatden.vn/webroot/img/files/texasuga.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/pikajogurijugenonozafuj.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/pisanewap.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/darevoxixesesoludede.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/nizesusobamukijajipotisev.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/poforutotinavaxiponi.pdfIn PDF document text
    • http://kes.org/upload/editor/files/66074963588.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/bogutomejoramum.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/pasur.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/67374933729.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/52969551451.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/selalujibuvemapegedejan.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210923070437.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/83304891340.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/3295754728.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/93775756628.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/61709245583.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/kipesubixamapuvudevoxox.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/80835206837.pdfIn PDF document text
    • http://freestyler.cz/img/file/20572508488.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16141db0573857---mazamezurubigivezo.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/fewameviwaxomikixexosem.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/45621364131.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=android+on+iphone+appPDF 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_off0000b4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF0 10160 bytes
SHA-256: 1b5d5da82c502cb1bc3fbe0633cfe1bd3e32a045c9e66b5017c19ecd1ef0182d
font_02_sfnt_off0000e37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37E 19236 bytes
SHA-256: 511e753f3bb43de56eab3637bfe388cfe1500a39c84968f4a05e4cdd9b2bcdc1