Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bba27a115dc829e…

MALICIOUS

PDF

79.6 KB Created: 2021-09-16 02:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a4381e113d0b4e7ed142d6f3832ac74c SHA-1: 587c2bc3776cc0ed913ebf45b1469561ea22133e SHA-256: 0bba27a115dc829e545aeb634b6e3afaee3d27ee1ef7ff2b34b9532b2cf7e04e
166 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains multiple external links, including one to an algorithmically-generated URL on a potentially disposable domain, indicating a redirection attempt. The PDF structure and embedded links suggest it is part of a phishing campaign or a downloader for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/26969143104.pdf In PDF document text
    • https://harom.ro/files/file/22170825868.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/ziwudusezoj.pdfIn PDF document text
    • http://tabletopad.com/images/file/narawerite.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/misopato.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/malonurado.pdfIn PDF document text
    • http://philipsphotographystudio.com/95085970042.pdfIn PDF document text
    • https://auto826.vnpec.xyz/uploads/files/dalolaxejapipaxa.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/rebewoxunafanuloki.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/23662185209.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/67747592756.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/42376817991.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/zafamarifiwovek.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/jumeviratefoworuxe.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/vegabipomojirifijuge.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/94557256878.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/witigeditoxagijonoxajomoz.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/85901090d378576015aa687d6f87c7bb/26877556356.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/37507834830.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/talafolola.pdfIn PDF document text
    • https://projetovm.com/uploads/files/nulatiwowama.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/43308575724.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=are+there+any+sex+games+for+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_off0000d39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39F 17140 bytes
SHA-256: 32f8f85559452cae3894f38f51fd9ae93b5ef87d17b085f0a132d3508fdd7138
font_01_sfnt_off00010018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10018 10952 bytes
SHA-256: 734fabcd550e2678e35f11dad8f234aafdf5f38dd823375c620a73d42517ae9d
font_02_sfnt_off0001192f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1