Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bdd97249c38ec09…

MALICIOUS

PDF

79.6 KB Created: 2021-04-16 23:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7e61a3d93f66bb161d32e15c9f6471f4 SHA-1: 22b5710e5f3b1a510f9b59ed434c966b1b15439f SHA-256: 5bdd97249c38ec09881eca95d2f3401d12430b4176a3adad30088590d7393617
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation designed to redirect users to potentially malicious sites. The primary URL, 'https://soxebez.ru/strik?utm_term=what+oil+does+a+ryobi+pressure+washer+take', appears to be a redirector for phishing or ad fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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://soxebez.ru/strik?utm_term=what+oil+does+a+ryobi+pressure+washer+take PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413467/normal_600dd14873d01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378623/normal_600ad607da9b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455657/normal_601f00427561e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403141/normal_5ff543657e784.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476302/normal_60078c451eee4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457563/normal_5ff8d9a3543fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493245/normal_5fd92e6478ef9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378386/normal_6062fcab51515.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481072/normal_6061ecda1c1a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426060/normal_605c6b193143b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380867/normal_60167d798a08d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413125/normal_5fc7f21554e87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411498/normal_5ffb515e94ae3.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://12f7643e-9106-4823-89c2-0bdaecd1bc22.filesusr.com/ugd/1f6d71_a12ed7f9486b4ff1b9da5bbf63de8d68.pdf?index=trueIn PDF document text
    • https://a16eeaf1-ab09-4fb7-bdbc-3ebfa24c279d.filesusr.com/ugd/03042f_81d4cb77e4f24647b59f34063f6d4183.pdf?index=trueIn PDF document text
    • https://083189c9-8220-4687-a375-57be19a37228.filesusr.com/ugd/909b15_e37e026b026040c78ae7e03eb998a810.pdf?index=trueIn PDF document text
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_3fa4b31932f44ff084a117eff46f2f1b.pdf?index=trueIn PDF document text
    • https://8d40832c-2e2b-4284-8151-bb35a16d80ac.filesusr.com/ugd/05d014_10493ead67e84bd7afe3df691e45dffc.pdf?index=trueIn PDF document text
    • https://9334512a-4df1-45dc-8804-f0fa1d9e2a3d.filesusr.com/ugd/9466eb_bff54a21cf4f44809210c625758d3729.pdf?index=trueIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_8e37e39b4fac4d4eb1eb763f3915ed58.pdf?index=trueIn PDF document text
    • https://746420f6-3007-491b-ba72-fd43be5094e5.filesusr.com/ugd/277b62_5a2ba39ad11946ce9edbade1b10a1140.pdf?index=trueIn PDF document text
    • https://9334512a-4df1-45dc-8804-f0fa1d9e2a3d.filesusr.com/ugd/9466eb_34aa69252e2f4c7cb94ebec128551047.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA2 5232 bytes
SHA-256: bd49a1728a5e707bccc1fc2c4085b1aa82821d7ad1e293949edee86a543ecc1f
font_01_sfnt_off0000fc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9B 11088 bytes
SHA-256: 3b46fdbf5512e83367436d59e8eb002a10569c65dd6b0910a252c1a1ecf7a7fa
font_02_sfnt_off00012295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12295 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361