Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc2a2e9d8cb4eabc…

MALICIOUS

PDF

72.6 KB Created: 2021-04-05 15:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1001cbd6f993a8e92c4b8cc0cb37972b SHA-1: 7b9a3b37399f03ca943107ca21c5ebc8ee8624b4 SHA-256: fc2a2e9d8cb4eabcfb59183886e526bbd0148de337354a5cd6f7f2326908e15f
134 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to a URL containing 'stairlift installation' and a suspicious domain 'xajibur.ru'. Heuristics indicate this PDF is a link farm on disposable hosting, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged it as malicious. The presence of embedded URLs and the link farm nature suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=acorn+130+stairlift+installation PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482860/normal_603713ba9bb2b.pdfIn PDF document text
    • https://cdn.sqhk.co/butofelo/vmgcgi3/viruses_examples_of_lytic.pdfIn PDF document text
    • http://j3vnci4.xyz/libro_geografia_1_secundaria_editoriwqlyb.pdfIn PDF document text
    • http://disojunis.iblogger.org/sonape.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471988/normal_600b9c84ca0b9.pdfIn PDF document text
    • http://biweekamnf.com/fosonivixixigelezarp2vka.pdfIn PDF document text
    • http://guketaz.iblogger.org/16888271674.pdfIn PDF document text
    • https://cdn.sqhk.co/dasofuduveje/hgzjjhb/xamupisareremolemapex.pdfIn PDF document text
    • http://pokupka.space/jikigosijuzuduy9g9v.pdfIn PDF document text
    • https://cdn.sqhk.co/lovolipeg/22hhcnT/adding_and_subtracting_like_mixed_numbers_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/funixatugesi/hgnhbij/xanugu.pdfIn PDF document text
    • http://cupe1.ru/equivalent_fractions_worksheet_ks3_tes0vqm0.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/hdB8hgc/counter_terrorist_agency_cheat_engine.pdfIn PDF document text
    • https://cdn.sqhk.co/wuluzajiroz/iheXjh3/mesuzeze.pdfIn PDF document text
    • https://cdn.sqhk.co/jufebarur/iajbuE9/64689874195.pdfIn PDF document text
    • https://cdn.sqhk.co/zuzipogowita/cHsjagc/puzzle_bobble_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/mewobonovagi/NC4gczS/urdu_stickers_for_whatsapp_2020_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mefemurebamegof.rf.gd/california_common_core_standards.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/free_expense_tracking_spreadsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/redoni.pdfIn PDF document text
    • http://zutagokakaki.rf.gd/92230821750.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_off0000ddb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB2 5220 bytes
SHA-256: 663c99b4b341208ab73aa43b2fc215350ef6e2b6fbab865452a130df3fbfadf4
font_01_sfnt_off0000ef8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8C 11104 bytes
SHA-256: 8fda8805fc82fb6098ce1f18bd5b425cfdd7feabc4e42a82442880fce360ad01

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