Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9bd0c586986e823…

MALICIOUS

PDF

78.0 KB Created: 2021-06-10 05:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 27121551d5aaf46ee23fd82c65cb6c0c SHA-1: ef24a411d1e2cb8b6936ccc7dfbab00585df30ee SHA-256: b9bd0c586986e823be917d4d3d65740510085d5d67b58a853c3ff659bed4fc4b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://wastran.ru/pbw?utm_term=how+do+i+pair+my+plt+headphones PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481516/normal_5ffe962543535.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451544/normal_6046e83249ae0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411250/normal_60623bbcb5383.pdfIn PDF document text
    • https://ledejikijosud.weebly.com/uploads/1/3/1/6/131607919/birutovotelur-vesefik-mapipa-bemupavisimofaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407988/normal_604b29f9418b9.pdfIn PDF document text
    • https://xukejexen.weebly.com/uploads/1/3/4/4/134480318/714925.pdfIn PDF document text
    • https://pepadamive.weebly.com/uploads/1/3/4/4/134468065/2272979.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/d12e2044-0ada-435a-a388-4dd9403890e0/xuxoreforo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/123f9541-18ea-4488-b2b5-051d6357b368/94615188638.pdfIn PDF document text
    • http://zubipuwaf.pbworks.com/w/file/fetch/144854952/wejem.pdfIn PDF document text
    • http://ladopupog.pbworks.com/f/dot_to_dot_free_printables_for_kindergarten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f46c3409-bd55-4aab-8e87-eebcdca35721/lozozuxubegulixa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa32a441-10f5-4926-ac5d-083ccbf912ca/gilerexanadiji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81a1dc10-ed92-45fb-b9f8-74ae10d8d1aa/banukukupizekizakuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82234490-0b8f-42ac-a9a6-0da2920df4b1/calendario_biodinamico_febbraio_2020_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffd90c93-0fe5-4856-b8c6-d57b8ad2e063/rodapiwidilogitigotiloxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ab06bfb-ca2f-42b2-b890-87d787be01b8/maze_runner_3_full_movie_hindi_dubbed_download_480p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbb147c8-14ba-4a6a-935f-c0a0dcd78e15/effective_time_management_strategies_for_employees.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2915717f-6d30-4990-bcc7-e02e48c6c79c/what_are_the_disadvantages_of_a_database_management_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75c480ea-ded9-472d-a31d-ce7f1dcd7528/xalojemanaga.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE504 5144 bytes
SHA-256: 2b25d9ee3f912fbc5fb5fb89b0972fd83e04820f52bd409e063c1ca7a99fe1b4
font_01_sfnt_off0000f668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF668 11284 bytes
SHA-256: e54fec6d5d08803b7cad52dffe743f50df492928355a2cdf9e7bbc9640f76293
font_02_sfnt_off00011cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF2 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333