Malicious PDF — malware analysis report

Static analysis result for SHA-256 449a5f00f851d1c2…

MALICIOUS

PDF

82.3 KB Created: 2021-03-04 23:25:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: e24a8cc700142a8f954167b74aa1e2d9 SHA-1: 181942f6a25931958e40f2426caa9e8173bc9116 SHA-256: 449a5f00f851d1c210f74f00f6bf0268b0cba4524157cf3b037df90feba30454
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/wix?keyword=bola+tangkas+gratis+koin PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4479451/normal_5fe39b3425652.pdfIn PDF document text
    • http://pemufosapakem.mypressonline.com/73923960700.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403688/normal_5ff6b50b0b514.pdfIn PDF document text
    • http://jurojegame.getenjoyment.net/roomba_scheduler_4230.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381090/normal_5ff56a0f4ea38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475861/normal_60110b15a98a4.pdfIn PDF document text
    • http://storeplus.pro/263070105683njgm.pdfIn PDF document text
    • http://idem-peshkom.ru/will_ps3_remote_work_on_ps4zjf6q.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kefodek/gowulusinafifito.pdfIn PDF document text
    • https://1b15a19f-c8c2-4d9d-8c2f-e97aa7ecfe2c.filesusr.com/ugd/eb6c48_063576ccd50b4b779fabdf759141b41d.pdf?index=trueIn PDF document text
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_161c37fa53e74af685af8c584951c975.pdf?index=trueIn PDF document text
    • https://2b12d24f-0c9a-4a32-b427-430aba395f0c.filesusr.com/ugd/6cfe90_ef3e365d32d047e99a5ebe01e2bfbfa8.pdf?index=trueIn PDF document text
    • https://33fe1336-4051-433c-b691-b763732126dd.filesusr.com/ugd/6c8f37_6e836fe3d8da46f9a6e53de63139f0d6.pdf?index=trueIn PDF document text
    • https://7be8961d-effb-4c78-a255-78c3c9f0be09.filesusr.com/ugd/3dd68e_b946af43fad64dc8b312591db4abe02d.pdf?index=trueIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_4e9ddc79a9f34cd3929e6c0ec7fafb67.pdf?index=trueIn PDF document text
    • https://2a984544-7cb8-4a4d-9f60-e686f7994e39.filesusr.com/ugd/1434d3_013d76a28591430e85b93c065b41e7a8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/lymphatic_system_anatomy_and_physiology.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/68633479409.pdfIn PDF document text
    • https://4f65501f-cdae-4966-b9db-49b15ad9d196.filesusr.com/ugd/52b593_7a0e746b6270494e8f53ff64ab963c21.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/minabiwa/sosebukuziwewunurupo.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/jifodi.pdfIn PDF document text
    • http://zepizevut.atwebpages.com/kupogeregeju.pdfIn PDF document text
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_0a274b87b2954b3590bce95106cf8e1a.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10705 4968 bytes
SHA-256: 0684488f75a2034a2684676441d15b86da212f94abe56c56d83489a33e86baa1
font_01_sfnt_off000117fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FA 10552 bytes
SHA-256: 8ebc7c205f0cf00a3e0bfa52609b07af9de7e4e1ea223f96ac0bc854d8ff5aee