Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fef1498b0f351ef…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 02:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8bea6fc1404b863a1c37ff4920df836b SHA-1: f25022ab3771ed602a3c08a5a6c2b2bcb7895147 SHA-256: 2fef1498b0f351eff31055522a140938c00cd8864c50871ac645491704b171f8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves directing the user to a series of potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://rails-bg.com/fckeditorfiles/file/rabuwut.pdf In PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/ujo3dk36si8ti66dorvv12hjlh/34559844025.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/82917048223.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/15264950056.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/69406915543.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f541ccac9d---95642254061.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/74737416779.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-11/20210911035755635052.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/56227638936.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/19448287571.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/16733162077.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/sefevofimeradifaxeniperu.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210909_163802.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/kevuwasogobakurudizufim.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/goxerawemox.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/kanido.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/16280642715.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/96189086259.pdfIn PDF document text
    • http://isvpro.com/custom/files/koxumosipowoditima.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210911181202198.pdfIn PDF document text
    • https://capecoralliving.com/media/file/88814124445.pdfIn PDF document text
    • http://fxlcd.com/upload/file/gifuzonolabefekiboxefu.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/95696460717.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210905150426_1091946887.pdfIn PDF document text
    • http://perfect-aerosol.eu/userfiles/file/68558794232.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/93994163420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=xa1+plus+android+9PDF 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_off0000d280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD280 19936 bytes
SHA-256: 0b2a7a72fed5dba07429c972954ec21d557b3640d8e416d1e13b4691901308b3
font_01_sfnt_off000106fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F14 10480 bytes
SHA-256: 45049b3105a9604d6b9a7da25e87e9a418459978cca79c94f35ceaff455328d8

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