Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6889fd19fdeb452…

MALICIOUS

PDF

72.4 KB Created: 2021-06-14 07:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8c6a46049a91861ceba2fc476d5448cd SHA-1: 17e36afd4118ef5a242a04b82c9f0014851ae6bd SHA-256: b6889fd19fdeb452e41f0b00be0fe0833e4b4cbe7531991ccb9027870319c599
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm hosted on disposable domains, with one prominent URL being https://medvor.ru/pbw?utm_term=vr+apk+torrent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://medvor.ru/pbw?utm_term=vr+apk+torrent PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408335/normal_60531908ebe1f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490125/normal_5fc56d9776fcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473651/normal_60505cde0a394.pdfIn PDF document text
    • https://tevufipe.weebly.com/uploads/1/3/1/6/131606546/6561072.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/58659d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501660/normal_5fe40ab47f5a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371524/normal_5ff660024446f.pdfIn PDF document text
    • https://vakejijumusefuv.weebly.com/uploads/1/3/5/3/135313512/gifonixiza.pdfIn PDF document text
    • https://tonibakak.weebly.com/uploads/1/3/5/3/135346506/papamijeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_602947b022996.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409621/normal_60369000125d0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lijegazoz.pbworks.com/f/is_shein_xl_true_to_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00d1e50c-822c-4437-828e-8da18f4e6233/how_much_does_an_it_administrator_earn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df187597-99cd-4420-b711-5a1f916a8778/2392506300.pdfIn PDF document text
    • http://kevuxezedila.pbworks.com/w/file/fetch/144736503/cobra_148_gtl_philippines_mods.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/074b9199-f04a-4774-a459-8e64c169286c/39070662792.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02E 4632 bytes
SHA-256: a877185cbe4e82231a5d99390f8ca03d8a886480eca39d48ff325ec647b4d601
font_01_sfnt_off0000f005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF005 10956 bytes
SHA-256: 7acbc1cc59fc601344bae13d80e2e564b9048f4d91081c092df70b91a9344fd3

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