Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a727d7fe17540f…

MALICIOUS

PDF

79.9 KB Created: 2021-09-15 23:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5c0e003fa4fa08c7086108b8842863a1 SHA-1: 56827a41813237b5f6633304a4e5d988124c35d8 SHA-256: 33a727d7fe17540fc54f8770a7df98dbe1411f5efec9cd6d19f009bab79fb189
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection, indicating malicious intent. The presence of numerous external URIs and a 'link farm' heuristic suggests the document's primary purpose is to redirect users to potentially harmful websites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://khanoomhoteli.com/basefile/khanoomhotelicom/files/59778213580.pdf In PDF document text
    • http://amexeuro.com/an3_Uploads/file/lekojalidimadowavibimekuf.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/jeduludofegazur.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/notusofabuvinatudofawud.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/60f18b96cf51b80a059f3b68ce0a373e/18822805124.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/39964742471.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/48895470273.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/leguledarexowuneribibi.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/45648821042.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/tatuzik.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/zigurobubevenul.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/64724570656.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75013471165.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/80639600691.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/pifunopulaxegawajelojizi.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/vibikojegazowenubegipoku.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/luvimeriz.pdfIn PDF document text
    • https://morabia.fi/images/file/jarawejunoxigisuxiso.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/basakamurotavumu.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/81699169433.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kemobaduresewasenesipowaw.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/sozesawewekuxoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=super+mario+rpg+armageddon+romPDF 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_off0000d2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0F 18048 bytes
SHA-256: bd36fe7a7567707cfd0a7a7c1bda65745d7a5a1f45266910588c484228b73f19
font_02_sfnt_off00011a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A66 10600 bytes
SHA-256: f0ac25b4dc3ad125e3db19e46c2436ea04eb512521b01a307c962afd11b31ce5