Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff36419673759f1f…

MALICIOUS

PDF

82.4 KB Created: 2021-09-08 14:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 49483e7370fb274010e0e371541470ef SHA-1: 22a9fdb5e4457ea810e813a7b125505680febf48 SHA-256: ff36419673759f1fafe98b624f641ba0c2fb9f3c059a8f65fb69b7975eea76fa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://microcement.ua/userfiles/file/manefetoxil.pdf In PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210905_758500F3CFEBC2CC.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/bibagobefasidawinag.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/puxusitipu.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/gonozebesolasezopa.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/migogibamanobajekezobufaj.pdfIn PDF document text
    • https://botroul.be/uploads/29113818129.pdfIn PDF document text
    • http://valeneighbors.com/userimages/98552019011.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/kanus.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77618865409.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/75254896016.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/15658180285.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210905_6EBEA4C1E70E2B3A.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/rewujexubumisu.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb5c2ce991---kasedakabijokulo.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/25396266884.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/3610156116.pdfIn PDF document text
    • http://woodwaysindia.com/uploads/94354875317.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/91982623970.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/38802141500.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/fukadi.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/9175292834.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/foraresizividujigalazal.pdfIn PDF document text
    • http://coolscape.info/images/files/togimimapusigeveri.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/8519678851.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=operating+system+pdf+books+for+mcaPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/sikaxalovin.pdfIn PDF document text
    • 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_off0000da92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA92 18004 bytes
SHA-256: 41ee2d724c071c45ba945e6be0fb6803f7db5dd9f3fed3cfbe5d2a6923b9f65e
font_01_sfnt_off00010959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10959 11288 bytes
SHA-256: 551e4cf851e6e1ce650085da606dab8a2fcf38f87cd05d03b4daabe7f0d5b40e
font_02_sfnt_off00012385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12385 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1