Malicious PDF — malware analysis report

Static analysis result for SHA-256 103519eeb7f23101…

MALICIOUS

PDF

75.2 KB Created: 2021-03-24 19:10:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 938cf9791f304df4b6f9b70550533220 SHA-1: 1cbbc7df68c73b53b98d8e8fe019cdfdffa228d9 SHA-256: 103519eeb7f231014dcd505d7a8700d98bfec177904dace75239f42aaf992c61
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/strik?utm_term=what+are+the+5+theories+of+punishment PDF link annotation
    • https://cdn.sqhk.co/dukosisevu/71jbTPM/motopo.pdfIn PDF document text
    • https://cdn.sqhk.co/vivepovugeli/FYMjiXn/donawuj.pdfIn PDF document text
    • https://rofixuninapo.weebly.com/uploads/1/3/5/3/135313709/411ef.pdfIn PDF document text
    • http://gojawufeki.getenjoyment.net/waste_management_project.pdfIn PDF document text
    • https://numuwawi.weebly.com/uploads/1/3/2/3/132303164/taxadebaralodo-dofefuwugetis-domizisur-gutawuwerera.pdfIn PDF document text
    • https://bujabofilurukok.weebly.com/uploads/1/3/2/6/132682168/b7b1c3f4.pdfIn PDF document text
    • http://vegofejolafud.mygamesonline.org/32494211864.pdfIn PDF document text
    • https://cdn.sqhk.co/lakekomum/tjihchh/free_stuff_uk_by_post_2020.pdfIn PDF document text
    • https://fijuzezakuxulow.weebly.com/uploads/1/3/5/3/135391315/kebugubexuwawitos.pdfIn PDF document text
    • https://cdn.sqhk.co/zizaratijiga/i4XWfgc/faxikoni.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/c9idAhe/mofudunuwugenodojorub.pdfIn PDF document text
    • https://cdn.sqhk.co/piwuzuberaze/6jiFIii/maze_ransomware_ioc_ip.pdfIn PDF document text
    • http://kolegutoravi.mygamesonline.org/joint_probability_distribution.pdfIn PDF document text
    • https://fosevagepuvuro.weebly.com/uploads/1/3/1/8/131858592/bebomuzoxor_dedagefuzadul_rurizesetar.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/ShbRVgf/newest_iphone_se.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/0df3d217-0116-46c9-a859-e9ae5c5a5455/29528637972.pdfIn PDF document text
    • http://peledopa.myartsonline.com/20592375722.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8c7857a-cbca-48b8-86ce-83382c616fd2/84639963660.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44272dbd-393a-4794-9297-d749a3c6eeff/dell_latitude_e6530_datenblatt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a6192e9-0f7c-4bda-91b2-435645c4decd/sexual_orientation_psychology_definition_and_example.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_off0000ebd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD1 5248 bytes
SHA-256: fe56302a44c8ca878130048017d69bf2578a5f60b15d362dc3e76cf55717e27e
font_01_sfnt_off0000fd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8E 9972 bytes
SHA-256: 02069b303cf8832512b978e2e8b1674bdbf3e6b01c5a8cdca75e02dd0b6cdde0