Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e1934a75e81afdf…

MALICIOUS

PDF

76.8 KB Created: 2021-09-21 00:36:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8aeea7e299d86012e961ae36627a11bb SHA-1: 2ac1d21ca843198121beef8a83af8f72755a3afe SHA-256: 5e1934a75e81afdf9b52018f63ef819cc234c3a07a87100bbdf5d003398a21ce
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of a second-stage download. The numerous unknown URLs suggest a link farm or distribution network for the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16148fc97c386b---fanuf.pdf In PDF document text
    • http://syntrend.critical.tw/upload/files/tirofulu.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/39361016432.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/71171759806.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/baxitatimimoxina.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/47016293672.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/81951309997.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/lobojigagagibud.pdfIn PDF document text
    • http://cellfruits.com/ckfinder/userfiles/files/83781939393.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/35249014735.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/af2f7759ac6f84862671423991c336a7/pufujuzada.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/97303274029.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/bufilimofomopabezif.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/salagafopovafobav.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/jotuxiwix.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/81268302372.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/vemulevezuruzikegezumamaf.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/3502560832.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/mewewu.pdfIn PDF document text
    • http://headrepublic.pl/images/files/50223618001.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/31032636043.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/vozereluba.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/53814589787.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/51022689117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=alphabet+phonics+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_off0000c74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74B 10736 bytes
SHA-256: 1e30d9f3698cc7fbdef77339f45b26c17845f641dd56812f0fd1ac402d17e0d3
font_01_sfnt_off0000dfb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C7 17816 bytes
SHA-256: b2156515fbf6a52756121a41fcb7685207b440d6edef3833c3b11fe40735d191