Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f87382db7f2754b…

MALICIOUS

PDF

80.3 KB Created: 2021-09-17 18:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 540b8ea0cf5d6d519c1a3ce96f0c72c4 SHA-1: 313759badd41013648a3297437d158cca3003ff5 SHA-256: 2f87382db7f2754bd92bde62179ff9cebdd5c603ff070055dd5c723f9e91830e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs pointing to disposable hosting, indicating a link farm designed to redirect users to potentially harmful sites. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://allytemp.ru/uplcv?utm_term=reface+app+for+android PDF link annotation
    • https://wfca-czech.cz/temp/userfiles/files/97225220427.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/someratuwofuxerowep.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/75382677267.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/pepasuxaxizepiz.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/52685105.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/89271049904.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/14534399756.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/161367f6716e3c---xomopuwevazutukoduwinejob.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/12131534458.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210917120509.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/viwimovuparupetezowakaruv.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/sazon.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/13678036431.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109150409488979.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/76139883413.pdfIn PDF document text
    • https://nistd.in/userfiles/file/66435529829.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/xokulizukubo.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee5d2426df---kudaxinomakupunusetewumox.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/36281984384.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/93997227875.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210913_201801.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/68625768147.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/76032231040.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vovuvas.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_off0000d5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFF 10344 bytes
SHA-256: 2261ebb621c023694058d2a2807ba4688b8d2976de935cac3728c1d1ecbcf83e
font_02_sfnt_off00010569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10569 17972 bytes
SHA-256: 2de912d012bc9b89ef54cd119ae0d9e257fa9fef4d3058fec933603ee8a4acf2

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