Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19d119806183443…

MALICIOUS

PDF

83.5 KB Created: 2021-09-22 19:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: be0451d83a8a7c4edca759ffa2adc6d0 SHA-1: 8e3d484690999602892cc777fa400a5bf5aa84bf SHA-256: b19d1198061834439697856e07a41ad0c23fd2d4d3068224d0dfccd1914073ee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, suggesting a phishing or scam lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating the PDF's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://inwebjor.ru/uplcv?utm_term=palace+of+chance+no+deposit+bonus+codes+2018 PDF link annotation
    • http://www.terresdescaraibes.fr/file/rebogomezanexuwaluxipapo.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/rovejuxipewozipuzuziloxi.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/degokurerupo.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/848ed6b138a31552203a85381f9770ac/gilajagapatosijuf.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/75374470478.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/defafomevirevuzekakijix.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/41976509942.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/kuwukudawapuluzotiba.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/lazibekakisedasuva.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/63042768596.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/kafagetopatodelig.pdfIn PDF document text
    • http://preiss.at/upload_files/files/87679937618.pdfIn PDF document text
    • http://www.memoriahistoricamalaga.org/ckfinder/userfiles/files/11713646522.pdfIn PDF document text
    • http://hbaoge.com/upload/files/63797789485.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/96029729194.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/nokipazupenifeku.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/mitoliposimeso.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/mosomolodutapu.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/tofegin.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/linigexem.pdfIn PDF document text
    • 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_off0000de44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE44 18456 bytes
SHA-256: 1623f0b3da10a38661331c3650b11658423553e0bece8abe42dd32cf8f97f12a
font_01_sfnt_off00010df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF9 11360 bytes
SHA-256: e8f9ccf81622cdd831875da6aaac45bd73f40773edc5fbb8e0a1bfefb9ce130c
font_02_sfnt_off0001287f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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