Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5af6573a904cfea…

MALICIOUS

PDF

78.0 KB Created: 2021-04-02 10:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1870c5f92e3545ed106752b2a89572e7 SHA-1: da8db5e8918e69b3997914420044d0d167a516de SHA-256: a5af6573a904cfeaae23e000cfe0c362f4fad057e632a888d6c65c836d5380b6
204 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' indicating a large number of outbound links. The 'SE_BROWSER_INSTALL_LURE' and 'SE_INVOICE_LURE' heuristics suggest social engineering tactics to trick the user into interacting with the document. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://leonvi.ru/award?keyword=anandamela+2020+pdf+download
    • https://cdn-cms.f-static.net/uploads/4472208/normal_605535008d081.pdf
    • https://cdn-cms.f-static.net/uploads/4414852/normal_602f600c14288.pdf
    • https://cdn-cms.f-static.net/uploads/4494874/normal_6042434e69bb7.pdf
    • https://static.s123-cdn-static.com/uploads/4393624/normal_60096ca212f9e.pdf
    • http://gazagidumow.mygamesonline.org/bwv_1013.pdf
    • https://vowagogo.weebly.com/uploads/1/3/5/3/135307183/86b61.pdf
    • https://static.s123-cdn-static.com/uploads/4406216/normal_5ff586643639b.pdf
    • http://lodomujimujug.mywebcommunity.org/how_to_ground_yourself_dissociation.pdf
    • https://cdn-cms.f-static.net/uploads/4385004/normal_601bbb03a01d7.pdf
    • https://linezajokopu.weebly.com/uploads/1/3/4/6/134629872/wigemesuzufuk.pdf
    • https://jorosovepi.weebly.com/uploads/1/3/4/7/134706332/3fd43f34718.pdf
    • https://cdn-cms.f-static.net/uploads/4416319/normal_60418ded09b51.pdf
    • http://fajujefa.getenjoyment.net/public_relations_job_description.pdf
    • https://cdn-cms.f-static.net/uploads/4483335/normal_605c3276d6fb5.pdf
    • https://tixanesel.weebly.com/uploads/1/3/4/2/134234664/381190.pdf
    • http://ziwewixowele.sportsontheweb.net/best_topics_for_english_conversation.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/326d3d67-94f8-4b8c-8a71-a9823916fa70/photography_books_amazon.pdf
    • https://uploads.strikinglycdn.com/files/8eb459bd-2c5e-442e-a59f-98868fc90a3f/minarusekexogagafiwo.pdf
    • https://uploads.strikinglycdn.com/files/1a4ffa2d-55cc-4b95-8680-11e637644eb7/rival_ice_cream_maker_gc8151.pdf
    • http://lagokatu.epizy.com/hallelujah_piano_version.pdf
    • http://jemekovivokuvup.epizy.com/children_s_christmas_songs_for_church.pdf
    • https://uploads.strikinglycdn.com/files/49141528-1d54-4a9e-9019-536b0fc9b571/generac_4000exl_oil_change.pdf
    • https://uploads.strikinglycdn.com/files/981ee919-7caf-4e2d-8001-33e2a31167d0/51929761193.pdf
    • http://tulifal.onlinewebshop.net/2294648911.pdf
    • http://mugafazeporose.epizy.com/xuledenefenomejadejaxobob.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f561.bin
43958594848d91741026c349656ff0b6299815737a82504f783d246a40198662		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF561 5268 bytes
font_01_sfnt_off00010753.bin
acc668968fa0382f912c382d181610115f81c0b41c55852ac520fd3db8a1afc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10753 10288 bytes

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