Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2e7f27132ac43e2…

MALICIOUS

PDF

83.1 KB Created: 2021-09-19 04:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 12b78dffb378b8ed69626d92975b2eac SHA-1: 56899726e7e6f122a4a6b54b80e00836e4f09040 SHA-256: c2e7f27132ac43e2351fabe9034fdd6135cf3668df904e10c34959415f507484
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 embedded URLs that point to a link farm, suggesting an attempt to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high volume of distinct, potentially disposable domains used for hosting these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://roseeskin.com/userfiles/file/20210914123217.pdf In PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/95357386454.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313ee6214c6---97490082782.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/9330139815.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/88667799982.pdfIn PDF document text
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/gatanafavov.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/42408308892.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/juginodagugulanojonowira.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/a6b21cb41d548a22346b6c9731cd12eb/gaberuxezetebesulubeliw.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/nobogubenitagef.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/jigokemivasibikiluru.pdfIn PDF document text
    • http://darstin.com/userfiles/files/kekowilagigalemonomax.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/begupovebamawisi.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/77099275766.pdfIn PDF document text
    • http://flomojapan.com/upload/files/muwibiponusugabumexun.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/75764380717.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/30644941415.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/37917676067.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/13104644538.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/jimepuzun.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210918162850.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/23622336197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=riverdale+season+3+watch+online+freePDF 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_off0000df68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77F 10940 bytes
SHA-256: 47700459e8c0e0d5e01b3d34a857f74987b1a9df3f71592d674f2a0ef6458656
font_02_sfnt_off000110df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DF 17560 bytes
SHA-256: 62af754bc103326fdaefac4b8a4c8491e051e270e7f839f616d6f662a0f8bb71

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