Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3f21740a786692…

MALICIOUS

PDF

174.0 KB Created: 2021-04-17 22:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: db27e6bf1e3574ccf6768a8edae121ee SHA-1: 53584f4ca14e0133418736554f328a11bc89a43c SHA-256: 8c3f21740a786692448cf8f6a1df30ff287fc5e9d156a801e1939770a83d40ce
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://lozipotod.ru/strik?utm_term=what+is+the+pass+rate+for+usmle+step+3 PDF link annotation
    • https://cdn.sqhk.co/pebekaja/jiagcMb/truck_wallpaper_4k_download_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/fupokonabat/hbaqhOv/11000750236.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469119/normal_6040008e01639.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483623/normal_606712c4a85e5.pdfIn PDF document text
    • https://xadatazibinul.weebly.com/uploads/1/3/1/4/131483053/69955a1ffe748.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446759/normal_602aa4272d6d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481684/normal_5ff5fcfbd3e15.pdfIn PDF document text
    • https://gugivubur.weebly.com/uploads/1/3/4/3/134390132/851f85cf1ab9ab6.pdfIn PDF document text
    • https://cdn.sqhk.co/wezokobuli/fghvjhK/lg_mobile_switch_apple_store.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473056/normal_6001197951ccc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464297/normal_600e5fe193fe3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447258/normal_5ff0da3cf0550.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_65237dc8460b4bfdbdaf7a80907255ca.pdf?index=trueIn PDF document text
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_59992ed06ec143569043aa5c7b2a11c2.pdf?index=trueIn PDF document text
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_9fe6f0c10c9d411087b2d024f9f360f3.pdf?index=trueIn PDF document text
    • https://cf587a47-7c2f-4f55-8bbb-21a4c73503f7.filesusr.com/ugd/8ea597_4e0f983c3a7b443a9cc54662d4324e6b.pdf?index=trueIn PDF document text
    • https://7a1f2a0d-094a-4466-88af-72a4af93b9fa.filesusr.com/ugd/22739b_7801eccdf040471c9a98433432935ba5.pdf?index=trueIn PDF document text
    • https://12f7643e-9106-4823-89c2-0bdaecd1bc22.filesusr.com/ugd/1f6d71_f4a7c9844520410090e3d1ca9a6f4d08.pdf?index=trueIn PDF document text
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_4efad36c6bdd40c5a691986a4afcac13.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

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_off00026da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26DA4 5316 bytes
SHA-256: 3287c55aa7cbcf20a1287fa709f8628d0c72e0e285303620a302fd68d8ccb8c1
font_01_sfnt_off00027fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27FA0 12684 bytes
SHA-256: c5d9894a2339ec06f9d0d7234f50f37685375d5e071de7402dab50664f711d12

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