Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b6adc1e3d9f79d4…

MALICIOUS

PDF

84.8 KB Created: 2021-09-08 20:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f5cc66b0816d8ba069103f5e9a38dada SHA-1: 8e77e464202319187776d454b92144f2e9e8559c SHA-256: 9b6adc1e3d9f79d4812f83a2af772e42cef600f58d647680f2cd066908b64d2f
146 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a large number of embedded URLs, many of which point to potentially malicious domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document's purpose is to redirect users to numerous distinct hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://rosebankprimary.co.za/inc/ckfinder/userfiles/files/82325979867.pdf In PDF document text
    • http://acutecardio.ru/sadm_files/bapifalutozudotofet.pdfIn PDF document text
    • http://imaginove.eu/data/Files/72026855069.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/sovon.pdfIn PDF document text
    • http://tnetimes.kr/upload/file///koziwuwesapavukel.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/wobajikurog.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/94901537230.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/7982953608.pdfIn PDF document text
    • https://blugarden.eu/file/didabunebuxagadotevepomuz.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210904/file/bikadewunezabadobakosu.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/18498255889.pdfIn PDF document text
    • https://brs.jo/userfiles/files/rokikewoxajijowusiwi.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/6819769982.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/24229538115.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/labumogijebizafen.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/18399864830.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/nurajosowolomeriromazi.pdfIn PDF document text
    • http://gorillatheory.com/admin/upload/file/50412697144.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/44404724430.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613520dcb1837---38913743007.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/zegej.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/wulusorurezobalotibuxu.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/jijebunosovumobamadize.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/74792639957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=kia+telluride+owners+manual+pdfPDF 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_off0000e3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BF 18668 bytes
SHA-256: ad4f863e3671ce696cb800a0f3ee7997616edd9b6bec5fcf6839a8fbf9aedbf6
font_01_sfnt_off0001149f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB6 10836 bytes
SHA-256: 699730be78e5bfde4e62a1dcfc38fdbcde0532f1a17b2fa140eacd3d1ab37278