Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0f6fdafdb3dbfc6…

MALICIOUS

PDF

79.3 KB Created: 2021-05-08 13:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e434d74865be9333943d9eeb248a0583 SHA-1: 23fe860e8e139eac498b6fa6facb9feb952084ec SHA-256: e0f6fdafdb3dbfc6f0e902615cdf3c5a7ccf377354154fe4eedfce7edfbd4dbd
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple embedded URLs, with one pointing to 'jacksth.ru', suggesting it's designed to redirect users to a potentially harmful site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious nature by identifying the PDF as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jacksth.ru/strik?utm_term=add+footer+to+wix+page PDF link annotation
    • http://vurejowug.mypressonline.com/nuposerifadufanuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459623/normal_602f6dd7244fc.pdfIn PDF document text
    • http://nojagemegoxeda.22web.org/eia_oil_weekly_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410983/normal_6044ce3e306a2.pdfIn PDF document text
    • http://fanutoragozogow.sportsontheweb.net/71220221865.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370076/normal_6033c2fba4c6a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412584/normal_6003c304ea490.pdfIn PDF document text
    • http://tikixoji.mywebcommunity.org/cgst_rules_updated.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489251/normal_605ce09a5868c.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://uploads.strikinglycdn.com/files/10f6b468-1554-4c21-b757-cddb94915d21/how_to_sort_words_in_alphabetical_order_in_java.pdfIn PDF document text
    • http://petilawunabebi.epizy.com/lazufajedobofowo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bef820f8-5d17-4d13-a666-6f19ddca0768/metulewewipakebatami.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/nulewutufavovov.pdfIn PDF document text
    • http://xezerokefewuxon.rf.gd/lacrosse_playbook_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b2ef23d-60ab-444d-a3f7-230f76e57f11/60046079828.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/amazon_adventure_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba25f30f-c004-46a2-8809-40364a037e01/xugasadeva.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB43 4828 bytes
SHA-256: c7ac1826a5801788119ee3caebb885568be3116f1a2da838b2ad321f5eb0a815
font_01_sfnt_off0000fbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDA 11472 bytes
SHA-256: 78458c866ccdc4ebff8b727637a7382fa5d8e71823708cb9e4448d93b578ae45
font_02_sfnt_off0001223a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223A 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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