Malicious PDF — malware analysis report

Static analysis result for SHA-256 03c7dcefecaa9376…

MALICIOUS

PDF

71.6 KB Created: 2021-09-09 19:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 6161b33f3f6bed5fc7c68f69b1d7848c SHA-1: 4d1d0e2affb3d0eb634bd83bee78217f20c15764 SHA-256: 03c7dcefecaa9376fe816d90d30ffa59ae97353c457ec94c2a5b15640b070b65
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3bf75abda---54339718362.pdf In PDF document text
    • http://progetec.org/userfiles/files/maxafodedozuxowifo.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/70124427118.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613390c8048ec---92199785884.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/gatuvurasotasodelulo.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/biforuzitetinog.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/46985816467.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/94206510877.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210903_080134.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/9129264018.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/fupumu.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/zinemozizalagotezak.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/mowukapitabikad.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1630924668.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/98665962392.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/vopalekedomolofulajonuwe.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/risogulivirakuxatilikefo.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/ximejamamo.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/27866515115.pdfIn PDF document text
    • https://photofetimages.com/pamosiw.pdfIn PDF document text
    • http://honghuibio.com/d/files/gidatiwuworodato.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/40708278427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=transforming+quadratic+function+to+vertex+formPDF 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_off0000b5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B5 11152 bytes
SHA-256: ce6f06da71ff36e4dccfcb881a997eb1c4061c7cf666ea2cdf45a15b158f519d
font_01_sfnt_off0000cf52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE764 15832 bytes
SHA-256: 4d3b1db39f7a8acc4fb8516f1823a0130fc021d7f75ea604e48da49f3e4c8a02

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