Malicious PDF — malware analysis report

Static analysis result for SHA-256 b08ee3d82f25337a…

MALICIOUS

PDF

76.9 KB Created: 2021-09-22 21:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 372846606704ebb672dec8852a83c455 SHA-1: 217986635fd04380553f762d6e2e289c1583b487 SHA-256: b08ee3d82f25337a39d0ec41a12be8107ee48cf5ca2d3f6060866263edb23bd0
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external resources, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://thuaphatlaihoanghuy.com/uploads/files/sonuxejapozixeta.pdf In PDF document text
    • http://csc025.com/userfiles/file/20210901212011_lp7s9g.pdfIn PDF document text
    • http://labradory.pl/file/wagabaxotefiwejupatosot.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/zifugakefu.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/55578129415.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/sabex.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/vurokise.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/36825735230.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/sexuzuwinumiguxebusako.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109010223085315.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/30237012505.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ic7oa9pgu57f939663smaeevn4/mivonuzef.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/mivisoxava.pdfIn PDF document text
    • http://www.heksan.com.pl/file/42944109753.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/rajepexotaxe.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/419d50fd9eefef0c93632d91486baec4/65441653421.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/5155244719.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/gilaxakifef.pdfIn PDF document text
    • http://infracsap.hu/files/file/47979205045.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/54592309683.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/doxesavusiji.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/wiwawut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=micro+rpg+mod+apkPDF 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_off0000c3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FE 10392 bytes
SHA-256: 4226665634ffa9a8c57af996b3988a98562af77820123dbded28e5ff01550539
font_01_sfnt_off0000db4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF360 19496 bytes
SHA-256: b6ee0da021be376494fde82c57b55b73ecd61b3a7ca7b670d4eaa4066762e850