Malicious PDF — malware analysis report

Static analysis result for SHA-256 252e3a7c0e4349fa…

MALICIOUS

PDF

79.8 KB Created: 2021-05-03 13:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0fb9bc0f0062b1ded6e90613490f13ff SHA-1: 2797094c9f1f244caa317ee02bdb5a57b5347650 SHA-256: 252e3a7c0e4349fa7f7f9a72a5c1e0787903f042bac6b6a79cb80a745a98fc46
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body, though partially corrupted, mentions 'how to write in ieee format', which serves as a lure to entice users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=how+to+write+in+ieee+format PDF link annotation
    • http://jidonuse.iblogger.org/board_game_vault_table_plans.pdfIn PDF document text
    • https://gikijeza.weebly.com/uploads/1/3/4/4/134465371/zosonobelo.pdfIn PDF document text
    • http://xivoxuvawet.iblogger.org/east_asian_korean_drama.pdfIn PDF document text
    • https://libufuvebugun.weebly.com/uploads/1/3/1/4/131406816/zenigukulavipojax.pdfIn PDF document text
    • https://mikixobitesa.weebly.com/uploads/1/3/0/7/130776626/bojusolenes-golejimir-mekowurozo-jogezexizo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_330aab5bc23e4618923d95eaafa8efbf.pdf?index=trueIn PDF document text
    • https://d09251a9-b09e-4077-8ccb-24037f005f7b.filesusr.com/ugd/a6ce17_f7f95f52a7de460a8300a79a48413e11.pdf?index=trueIn PDF document text
    • http://lazasubesuwup.epizy.com/29634117262.pdfIn PDF document text
    • https://d05b2b94-0af3-401c-a6ef-75d00d0b58ae.filesusr.com/ugd/3bca44_42851d804ae84b81bda6bba585f17458.pdf?index=trueIn PDF document text
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_45838cf66230478e8bcbbc16c541c0eb.pdf?index=trueIn PDF document text
    • http://sevawudefogu.rf.gd/barsaat_1995_full_hd_movie.pdfIn PDF document text
    • http://keguwaburafokul.epizy.com/vikopam.pdfIn PDF document text
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_fcd44051fa5a4cd882e8abc602db2856.pdf?index=trueIn PDF document text
    • https://7322f44d-5cb7-45f5-8521-a79093f6ce74.filesusr.com/ugd/dd0890_8971a347f12348cb9faa0641904f98de.pdf?index=trueIn PDF document text
    • https://a2fe464c-28d1-4db8-bb2d-552ad9bc2f4d.filesusr.com/ugd/941bb1_eff1065aef204fe391c0800766fad6dd.pdf?index=trueIn PDF document text
    • http://vezuzatutuxi.epizy.com/jugivovogifalakexuneje.pdfIn PDF document text
    • http://nofaramubibuv.epizy.com/honda_lawn_mower_hrx217hya.pdfIn PDF document text
    • https://590703a0-be71-4d3c-a49f-17767d5969ef.filesusr.com/ugd/656c20_dfceb6e2616b436eb103ec3d3c004778.pdf?index=trueIn PDF document text
    • https://2ddc7431-ff91-46e9-9708-195efd6cc195.filesusr.com/ugd/ffe0d3_1788d11918e9410697aa82b51fdf735f.pdf?index=trueIn PDF document text
    • http://ganofebaleto.rf.gd/autocad_lisp_commands_list.pdfIn PDF document text
    • http://womilebejip.rf.gd/gevolowusavujudusa.pdfIn PDF document text
    • http://romuwoturifitam.epizy.com/bepanah_pyar_hai_aaja_song_pagalworld._io.pdfIn PDF document text
    • http://xotexipu.rf.gd/lokejamolizinuzefirivi.pdfIn PDF document text
    • http://kawanasigupezin.epizy.com/mogidonetegawugolematuk.pdfIn PDF document text
    • http://donenufalu.rf.gd/w3schools_c_download.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_off0000fc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC82 4756 bytes
SHA-256: f357b7e6ef1733a2fb6db097af4aa235093b53bd818fe95f25b9b33a10c95a5c
font_01_sfnt_off00010ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA0 10900 bytes
SHA-256: d7faa651fbc2f86d7c3b3887bd959ee792816ac45157ac040f139700a5d85c6e

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