Malicious PDF — malware analysis report

Static analysis result for SHA-256 8067a4d13a929242…

MALICIOUS

PDF

85.7 KB Created: 2021-09-18 07:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0807f5f2b1f4c6e9384c263bf6b3369a SHA-1: 30615b079905846df7be94441c2a6c404993b6c1 SHA-256: 8067a4d13a929242a0b3a2292a407600c76637723c542a58b67d2714ce0bce64
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm hosted on disposable domains. This suggests the primary purpose is to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://salt17.com/userfiles/files/siruki.pdf In PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16135e63023984---xikujisunofevovut.pdfIn PDF document text
    • https://priscar.com/documents/files/fifoxebipukedeludoxako.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/24613036325.pdfIn PDF document text
    • http://dfanchem.com/upload/files/84440878257.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/39345290221.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/67568895412.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/libuwuso.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/2397717769.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/klbnpmgurqa3fab3nrlmq0bj3h/nukigegejovazuv.pdfIn PDF document text
    • http://tieuhocsondong.hoaiduc.edu.vn/ckfinder/userfiles/files/54084675710.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/soxali.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/foful.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/gasadofejosokonudo.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/mozofujezow.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/gewegi.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/zepixuzukepozoketukezodow.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/63203345765.pdfIn PDF document text
    • http://slovoveri.org/userfiles/naperabumulit.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/20219161720372448.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/posoboxor.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/87160320597.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/ketipajuwetareg.pdfIn PDF document text
    • https://jjpremiers.com/files/6274013129.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/vexuzezavov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=restart+android+phone+without+screenPDF 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_off0000e947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE947 18064 bytes
SHA-256: 4d886edb336af3bec7ffd3c2487f67671a979db8ac9f830e9aa67ddd4e5d4778
font_01_sfnt_off0001183e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13055 10796 bytes
SHA-256: c85119f14753f9104a3172a76ddcb053f565b43dd8d84e5397eda60f7054630e