Malicious PDF — malware analysis report

Static analysis result for SHA-256 d47c2f4c9f9dd1e5…

MALICIOUS

PDF

64.9 KB Created: 2021-06-12 22:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4def917e4fe28278b443e9724aba7768 SHA-1: 317d7770d930532388a246722b46137857947dad SHA-256: d47c2f4c9f9dd1e5fd4026e5ae06a76a205ee219d7f895dd03cb5f9fdd03284c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of external links, many of which point to disposable hosting services, suggesting a link farm or phishing operation. The presence of a URL with 'utm_term=mortal+kombat+11+all+skins' indicates a lure to attract users interested in that topic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://irlanc.ru/pbw?utm_term=mortal+kombat+11+all+skins PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461767/normal_602f5bf8e41cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401716/normal_5fc8e7307ba74.pdfIn PDF document text
    • https://volifinidolil.weebly.com/uploads/1/3/0/8/130873876/7137679.pdfIn PDF document text
    • https://fosewawigikutuw.weebly.com/uploads/1/3/1/8/131871484/874056.pdfIn PDF document text
    • https://siromalad.weebly.com/uploads/1/3/5/3/135312661/f57b714.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420756/normal_5fda1fb06e3e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498345/normal_6059050fa3f67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417138/normal_6005d346e5dab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477155/normal_605f72886c2ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370087/normal_603cb8b34c23c.pdfIn PDF document text
    • https://vozedebilonede.weebly.com/uploads/1/3/5/3/135333302/senoxixifuxi.pdfIn PDF document text
    • https://lelameju.weebly.com/uploads/1/3/4/0/134040913/nonaseko_desizapepo_revafisowabikuj_pogalibok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389376/normal_5fd1062e55a06.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/d2739a59-801e-470a-a839-1fc922314a52/sql_server_2016_for_developers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4f0ac02-45a1-4ee9-9bed-cca28928a97f/tokuropatovoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3835b318-6a9d-461f-9ace-229cb243cd9a/snapper_garden_tractor_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3d64630-f6fa-48ef-a082-780ba7b49b54/favaburewalosilakofiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9913d030-9dec-4120-86d6-028fc04771eb/gigelowalela.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_off0000c40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC40B 5092 bytes
SHA-256: 7a3de10213f6b0e6605a4be28842fe8a6976cad0b6aae539993b331999cedbe4
font_01_sfnt_off0000d550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD550 9808 bytes
SHA-256: bdeed676b1de41e6a8bd64a5b9b9685aba2195e3db8cf381e5d3d69058d621b9

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