Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d5604f9637b54e…

MALICIOUS

PDF

74.7 KB Created: 2021-05-11 01:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: aca4e15a3d1831ccd7287758b34618ae SHA-1: 80e0ab5ab84de5d1f1d58291e5952bfc4eef268d SHA-256: b1d5604f9637b54e81eb4818a747593fb64c600549e7eb73d09ad41fbed532c8
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of embedded URLs pointing to disposable domains, suggesting a link farm designed to distribute malicious content or phish users. While no scripts were extracted, the presence of numerous suspicious URLs strongly indicates a malicious intent, likely related to 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
  • 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/strik?utm_term=digital+marketing+plan+example+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389366/normal_603ccd65b5147.pdfIn PDF document text
    • https://cdn.sqhk.co/baxemazisod/hohiRjd/sikozir.pdfIn PDF document text
    • http://strahuemsya.info/595691112441ljrl.pdfIn PDF document text
    • https://cdn.sqhk.co/fepefudasor/avNDHGB/noxijodazizi.pdfIn PDF document text
    • http://olipaka.xyz/how_to_repair_honda_small_engine_carburetorehsav.pdfIn PDF document text
    • http://gufutaca6.xyz/se_hai_bisogno_di_informazioni_in_inglesebmpcv.pdfIn PDF document text
    • http://new-leggins.site/how_to_export_keynote_into_powerpoint0pz2x.pdfIn PDF document text
    • https://cdn.sqhk.co/wewuxujudu/wgcidge/telegram_app_review_2020.pdfIn PDF document text
    • http://detonic-deutschland.website/45220285012cgpii.pdfIn PDF document text
    • http://megantv.site/lotus_notes_8._5_guide_utilisateurg6kwc.pdfIn PDF document text
    • https://cdn.sqhk.co/xizefonuma/1ifvvja/world_subway_simulator_premium.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446016/normal_5ff27a93d594b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366628/normal_5ffe7057236c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417535/normal_606273cf47059.pdfIn PDF document text
    • http://freds.space/73840720226eh34c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418981/normal_6021d28563a01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453328/normal_601f992ad1f53.pdfIn PDF document text
    • http://lightly.store/330162098909h32e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9502a9f5-3c5e-4a66-8131-16f6753fae72/49704831589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/539f8993-ab12-4afb-93b4-f3fda479dd3f/79895899172.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_off0000e7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B4 5316 bytes
SHA-256: 5c2f7d8551b000b886b1046e5e804ec3db97cce7bc42bd6a5dc1ff53977ef67f
font_01_sfnt_off0000f9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C1 10520 bytes
SHA-256: f7765262a9ad321e9e2b76b73b0796b91698be523986b5202f13eabfda50ee28

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