Malicious PDF — malware analysis report

Static analysis result for SHA-256 3500211c3313d705…

MALICIOUS

PDF

75.3 KB Created: 2021-03-29 04:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ecfdb34b57d86b7816e617f177783644 SHA-1: cc8fa8bfe873c68b1798c2d30e7c66d14a0b8f27 SHA-256: 3500211c3313d705ac41226ee199a71c4eff6f1651bb3d62403264c5db6ecbf3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/award?keyword=arrange+pdf+pages PDF link annotation
    • http://znalomstvavip.site/how_to_start_drawing_architectureuyzow.pdfIn PDF document text
    • http://topdiscount.pro/commander_sk_inverter_manualvacu5.pdfIn PDF document text
    • https://mifafipuwekirej.weebly.com/uploads/1/3/5/3/135327035/d21d137e69.pdfIn PDF document text
    • http://load-bcp.com/tivabirudabi0vk15.pdfIn PDF document text
    • http://atlas-copco.su/lexus_es300h_hybrid_specificationscegbi.pdfIn PDF document text
    • https://kiriwalukejogof.weebly.com/uploads/1/3/4/3/134310578/mamolozalewifavuxar.pdfIn PDF document text
    • http://pumba.fun/who_is_the_father_of_human_resource_management_in_indiak2im2.pdfIn PDF document text
    • http://busforpay.online/what_is_the_cost_of_a_navien_tankless_water_heatervwd80.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zubafazebet.epizy.com/lands_end_trail_map.pdfIn PDF document text
    • http://sodexodape.rf.gd/bekuladisu.pdfIn PDF document text
    • https://5c817321-7c0c-448b-959d-deb1da9fd788.filesusr.com/ugd/19103d_2085f460614f4d88a1f39739766e424d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/956e22e4-db4f-4a3e-81f6-37f305b397e3/56658732946.pdfIn PDF document text
    • https://3d636ecf-b5c4-4691-845c-2d501a7a8090.filesusr.com/ugd/b09df1_1d36dacf9fb74ca9937eb296fde8a30d.pdf?index=trueIn PDF document text
    • https://a7563df4-ba19-4d82-a8a0-b2470d957038.filesusr.com/ugd/61f964_f601254601bf47b1b24785920140cdf9.pdf?index=trueIn PDF document text
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_065065eabfa148efbfb7019a3c18a696.pdf?index=trueIn PDF document text
    • https://ce722411-b424-48ee-ac00-b4ed8818edd9.filesusr.com/ugd/bff0de_f92849289ac8459093594710d8d38f8e.pdf?index=trueIn PDF document text
    • http://falisetiven.epizy.com/worldview_satellite_imagery_browsing_and_ing_tool.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57b65aa2-a1d3-4814-8fb3-fb5a02b6d978/death_note_2_netflix_release_date.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_off0000ebba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBA 5164 bytes
SHA-256: 6be0c2e36d927858d60319fb6d856dfa42dc3cbbf1e65480a82b6fd1b9db9b57
font_01_sfnt_off0000fd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5D 10116 bytes
SHA-256: 1198b6f84a4df0aa8b8bad5056b9e3c314d670a7f709ba03e37c95deedae4ce4

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