Malicious PDF — malware analysis report

Static analysis result for SHA-256 3260b3900bb591c5…

MALICIOUS

PDF

71.8 KB Created: 2021-09-26 13:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2912387d51ec95214e10f6de03576c04 SHA-1: dd11b8e6e196f50727d0d0899c90d697d7696245 SHA-256: 3260b3900bb591c5cf65618aed68171bcae207c8cac1191f92fd71fde7482499
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high density of links on disposable hosting, suggesting a phishing or malware distribution attempt. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://baobiachau.com/luutru/files/42603870980.pdf In PDF document text
    • http://vetsnab32.ru/userfiles/file/pibog.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-17/20210917002433532731.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136bbaacf600---57954780246.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/81962497661.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/jedanulo.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/39341887100.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109201935218498.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/zosutuvireru.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/jspj4afr3gb049jtses0804j10/gomeseviwug.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/panugefejomiga.pdfIn PDF document text
    • http://fullx.net/files/16760404255.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/tawiruvidupate.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///gexinerevusulixomewe.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/jizovavazusixewuzisisox.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210914094953.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/kuwuluxemawenumexinur.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/xiwar.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/sowirodepetekegobagivazu.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/rapupudifesivaxupodow.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/dorasowomesowavofu.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/fokupepobiwowinipamob.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/83266737118.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/bisawutamovuvowona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=sync+zoho+contacts+with+androidPDF 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_off0000b1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DF 17940 bytes
SHA-256: a5c5796f388e88897724302c232606b6f98d169c46e21ba60b61fab29b670e3d
font_01_sfnt_off0000dfce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E5 10624 bytes
SHA-256: f22a92c75e404520652d51ffe8b4bc81f47ece8bc232971917d1ea241639cbd6