Malicious PDF — malware analysis report

Static analysis result for SHA-256 9421493b6fd3a9b7…

MALICIOUS

PDF

85.6 KB Created: 2021-03-05 03:10:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 21b036d3201cd9f089f9d04a9b37ef26 SHA-1: 76fcc4e56e2fbf39eeda0ca7aaa578f8163eb0af SHA-256: 9421493b6fd3a9b71e9d61a1e4766349aadb6a10c536d87809be64d834534223
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, many pointing to disposable hosting, suggesting an attempt to redirect users to potentially harmful sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate a pattern of distributing links, likely for phishing or malware distribution. No scripts were extracted, but the overall structure points to a malicious document designed to lead users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://gimoguvi.ru/strik?utm_term=o+diagrama+de+fases+ferro-carbono PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379964/normal_5ff51db9a07f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447630/normal_5ff2a47da8799.pdfIn PDF document text
    • https://cdn.sqhk.co/govazilose/5N7ZNgi/hero_spider_coloring_books.pdfIn PDF document text
    • https://basapozixuw.weebly.com/uploads/1/3/4/7/134701575/saliduzudinibid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451368/normal_5fda0c3e38cf2.pdfIn PDF document text
    • https://cdn.sqhk.co/nomevagume/IaxmQij/xedibire.pdfIn PDF document text
    • http://rinujajija.getenjoyment.net/sosimin.pdfIn PDF document text
    • http://rasezatoxefu.mygamesonline.org/68433149683.pdfIn PDF document text
    • http://gakukuketisalum.scienceontheweb.net/dupokurazitokaguliretiw.pdfIn PDF document text
    • https://vilinumatilaji.weebly.com/uploads/1/3/2/7/132740241/nefur.pdfIn PDF document text
    • https://dumidonawusirug.weebly.com/uploads/1/3/5/3/135306770/2017393.pdfIn PDF document text
    • http://dodemul.mygamesonline.org/49108782701.pdfIn PDF document text
    • https://livadasim.weebly.com/uploads/1/3/4/3/134312527/7a3771bdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475196/normal_5fd8f8a83d18f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453144/normal_5fe15902999fe.pdfIn PDF document text
    • http://davupopebuwiser.sportsontheweb.net/peselopufobituvofugeke.pdfIn PDF document text
    • http://xosubowavenu.mypressonline.com/gadofoku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://c370dac7-4848-4fa0-a6df-94361299e8ba.filesusr.com/ugd/fa6303_cd950a66da48427ca9810e64065ef5c2.pdf?index=trueIn PDF document text
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_2f60d857d774475a91728695c4f274e0.pdf?index=trueIn PDF document text
    • http://sajoveguduv.onlinewebshop.net/95083916226.pdfIn PDF document text
    • http://nojikigor.myartsonline.com/in_the_heat_of_the_night_book_setting.pdfIn PDF document text
    • https://9d76d0c6-5807-43ac-a2ba-7b4112d1a20a.filesusr.com/ugd/5cd33b_8b4237f6d265407585bb687a01c4450b.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC87 5216 bytes
SHA-256: 55a511ffafceea9f4ad40cee44cc85b55115801748cd6020d9be792066128d8c
font_01_sfnt_off00010e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E30 14452 bytes
SHA-256: f64ae62523ebc70604d9cf7f65133632f23b98c35977eab93022d39ea0b1b85d
font_02_sfnt_off0001392c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1392C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2