Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bfa5d28c3aac4b5…

MALICIOUS

PDF

68.5 KB Created: 2021-01-27 20:10:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3b1e646b29d70265b0629e230e766983 SHA-1: f9c7afb7986b034681359318e6cbbf789b91fab0 SHA-256: 0bfa5d28c3aac4b5590c19da030c09c802ef19639c7c0a0f246a2489b61f3852
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wb?keyword=pikmi%20pops%20jumbo%20plush%20dream%20the%20unicorn In PDF document text
    • https://static.s123-cdn-static.com/uploads/4481988/normal_5fcbddc757976.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380072/normal_600a3c56ce4ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457320/normal_5fec369576e19.pdfIn PDF document text
    • http://winclean-shop.space/airplane_flight_pilot_simulator_download_for_pc3bjqt.pdfIn PDF document text
    • http://golden-bridge.pro/download_game_dirt_xtreme_mod0xxdr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419849/normal_600eaeb869c41.pdfIn PDF document text
    • http://lisolu.org/391668537611uxt9.pdfIn PDF document text
    • http://lunesygets.xyz/50471849662xq28d.pdfIn PDF document text
    • http://svarka-aurora.online/ligoxendsm4w.pdfIn PDF document text
    • http://help-copyrighteamservice.com/19088840034a70s7.pdfIn PDF document text
    • http://activa-fb.com/178451873067rdsb.pdfIn PDF document text
    • https://cdn.sqhk.co/vilomikov/0ieif3t/4451186360.pdfIn PDF document text
    • http://brumbum6.xyz/knockout_race_descargar_pc122tz.pdfIn PDF document text
    • http://stc-l.ru/841364769923ck51.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/gotitibekovi/android_9_google_assistant_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/79060084039.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB18 5596 bytes
SHA-256: 2262f6ecaba5c523b55db460d753e28102b4f77edcfb4f148d3d415c1f06bd93
font_01_sfnt_off0000ddee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEE 11076 bytes
SHA-256: 827eb293818d6d8c785b48aaf970910bf282076a53718b13b9a3d8b49878fe2e

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