Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d1164302b9bcb0…

MALICIOUS

PDF

90.1 KB Created: 2021-03-21 10:55:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d919c033be79ea3465d32167d7509778 SHA-1: 28fa154759bfc213368a8504da51793310c6c92d SHA-256: 18d1164302b9bcb0b661307790d95b7c66057d4af6a693d1e6cb763098421263
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, directing users to various domains. The primary URL, https://ponafet.ru/123, is associated with the lure of IELTS reading test answers, suggesting a phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and the heuristic firings strongly indicate malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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.
  • 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/123?utm_term=categorising+love+ielts+reading+test+answers PDF link annotation
    • https://cdn.sqhk.co/zimamoko/n453hbr/11999080110.pdfIn PDF document text
    • https://cdn.sqhk.co/pulafefer/cNxYhar/xejupa.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/iu70Lib/panini_mosaic_nba_basketball_trading_cards_mega_box.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403807/normal_60437a0dda644.pdfIn PDF document text
    • http://ranomurivokav.22web.org/53053199247.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404987/normal_60028cadbd6d4.pdfIn PDF document text
    • https://gonalibage.weebly.com/uploads/1/3/4/6/134652093/7996abc513438.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485445/normal_5fd8bd9222c73.pdfIn PDF document text
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/wepajepaliriv-wufumikafalo-xisagewi.pdfIn PDF document text
    • http://nalapagized.22web.org/nurujavusesefofosenijib.pdfIn PDF document text
    • https://jebezijako.weebly.com/uploads/1/3/5/9/135964749/fozefalikigakumeju.pdfIn PDF document text
    • https://vuzaruluweketex.weebly.com/uploads/1/3/4/4/134478477/ruxujolud-texubefomina.pdfIn PDF document text
    • https://figusemaf.weebly.com/uploads/1/3/2/6/132682639/soboziwe.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/LgjLK5J/big_baby_davis_celtics.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/30027420359.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/baldi_s_basics.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/nba_fantasy_basketball_draft_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/10197476904.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/13127529406.pdfIn PDF document text
    • http://zasogiw.epizy.com/agreement_format_for_unsecured_loan.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/98343894144.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/daubert_tracker_case_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/nccn_guidelines_hypercalcemia_of_malignancy.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_off00012353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12353 5048 bytes
SHA-256: 57c7baf46432f50b424a80c1d78bb7f0dcd1e233c15e5237a67dc25924dc0ed7
font_01_sfnt_off0001349d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349D 11188 bytes
SHA-256: 1c17a6e91932159258a478803c2864f1b6c6f36936aa4ef8d4b5199825cb6450

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