Malicious PDF — malware analysis report

Static analysis result for SHA-256 327755327bed7d09…

MALICIOUS

PDF

90.8 KB Created: 2021-04-12 18:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: cc63b4dbe99df3910156831886f60a23 SHA-1: 47140b67d0836d275a3734867afb77752d92117d SHA-256: 327755327bed7d091ba850f102db9c0aa95b153fad1f6da2f6fb2b510aeb47f5
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one specifically pointing to a suspicious domain 'xajibur.ru' that appears to be part of a link farm designed to redirect users. The PDF's structure and the presence of many external links suggest an attempt to lead users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/strik?utm_term=fifty+shades+freed+songs+listen+online PDF link annotation
    • http://bigijawiv.scienceontheweb.net/yogananda_paramahansa_autobiography_of_a_yogi.pdfIn PDF document text
    • http://ridunculus.com/henry_tropicool_roof_coating_reviewsjrsjq.pdfIn PDF document text
    • http://womans30planet.com/28610511817gt41s.pdfIn PDF document text
    • http://kimugifogetami.medianewsonline.com/annex_14_icao.pdfIn PDF document text
    • http://suzofovolavuk.scienceontheweb.net/21319004317.pdfIn PDF document text
    • http://potuduwatolebu.mywebcommunity.org/72730322774.pdfIn PDF document text
    • https://cdn.sqhk.co/jimatoju/geIgj6S/stickman_falling_down_stairs_game_2.pdfIn PDF document text
    • http://jupifidupepir.getenjoyment.net/46295518353.pdfIn PDF document text
    • https://cdn.sqhk.co/mojazejo/hbjhtct/eve_online_faction_warfare_missions_guide.pdfIn PDF document text
    • http://dayzcommunity.info/hamilton_beach_air_fryer_oven_instructionsw3g9b.pdfIn PDF document text
    • http://aazzzry.space/bubble_test_sheets_print5xhxy.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/alfa_romeo_giulietta_specifications.pdfIn PDF document text
    • http://lawexape.mygamesonline.org/public_relations_file.pdfIn PDF document text
    • http://circulshtangcalip.website/62212679048oehlk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_fc3f91ae916f4c2782c57603a16a62db.pdf?index=trueIn PDF document text
    • http://wokarodefi.onlinewebshop.net/farodokometinemo.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/how_fast_can_a_49cc_gas_scooter_go.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/instant_pot_electric_pressure_cooker_cookbook.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/spelling_worksheets_for_grade_12.pdfIn PDF document text
    • https://4dd4a32c-aced-41d2-87e6-7ff9ca8080d7.filesusr.com/ugd/6d6f33_bdf946cd9f31429b9f4499bbb64a8f21.pdf?index=trueIn PDF document text
    • http://wepikupovug.myartsonline.com/emotional_intelligence_test_questions.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_off000123bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BB 5224 bytes
SHA-256: 5af79adf1b44e3e23b787f9ddf39327fadcf1fc9e3db0c4d6448b697b8214cdf
font_01_sfnt_off0001358c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358C 11868 bytes
SHA-256: 1de80c24b6213e967f358055673d5df73681a78985474b346ca520598e645009

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