Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e198cdeb5c0d86…

MALICIOUS

PDF

70.6 KB Created: 2021-09-16 20:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2cba10494bbf7d65035d9b46aad6905d SHA-1: 94b561c62858e2295503c8b507128626f2f00db5 SHA-256: b8e198cdeb5c0d868f8fce07f99619e9d50abb30c0d8b8fc22eca7fa9853b91f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files hosted on potentially disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this. No scripts were extracted, but the overall structure and URL distribution are consistent with a phishing or malware distribution campaign.

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://edu-family72.ru/content/images/uploads/file/dubusigumawu.pdf In PDF document text
    • http://lineshare.net/upload/files/20210905235654.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/sutujegitejefisedezexodi.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/4720043480.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/15774773535.pdfIn PDF document text
    • http://meskerjager.nl/media/files/didesuzaxuxaxusuxu.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/xakav.pdfIn PDF document text
    • http://enricobarraco.com/files/73817927999.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/37969775317.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613efe1eafced---jakixozure.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/rezemimirezulu.pdfIn PDF document text
    • https://menu2uplus.com/images/file/27326862792.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/kegepunibudet.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/zuwozovinemebe.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/389986646.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142168f6a01a---bolobaxoboxajubedaw.pdfIn PDF document text
    • http://budropol.de/Upload/file/lexugapav.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/fekul.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/71074139892.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/458649895.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/53283340756.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/66501479161.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=adjectives+from+letter+oPDF 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_off0000b7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCB 15088 bytes
SHA-256: b54f6b6dc3b3072a5094d5979bc0a524ce052ecb78e9a1865b1e26b65617c25b
font_02_sfnt_off0000f4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FF 10548 bytes
SHA-256: 5bd0ebd53d1dbe859cbfcc688b260b900b67268d9f1fe51cef2bd45bad921d04

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