Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0ec5d0a996c8fb…

MALICIOUS

PDF

73.5 KB Created: 2021-03-18 11:43:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b6325fbc1cd16bdfd2abaff7d49a3e88 SHA-1: 303e1306fc9ef9e92790158f61f1e05bde8b91d9 SHA-256: dc0ec5d0a996c8fbc2bdd225c43e4bd941c1c08a96b70e4e131840e997127f3d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://leonvi.ru/award?keyword=portugu%25C3%25AAs+para+estrangeiros+pdf+download PDF link annotation
    • https://cdn.sqhk.co/wuwovodegi/eBRiuhi/91544200080.pdfIn PDF document text
    • https://cdn.sqhk.co/winelolibug/cigjhgc/69045925885.pdfIn PDF document text
    • https://cdn.sqhk.co/jagojixego/nqgdphe/wixaxenedetewikusalal.pdfIn PDF document text
    • https://cdn.sqhk.co/wadusazilox/yjjHWhi/20394450479.pdfIn PDF document text
    • https://cdn.sqhk.co/pobopuwubox/a4ihjcc/vefexagurozojukado.pdfIn PDF document text
    • https://pekatube.weebly.com/uploads/1/3/5/3/135393066/gonufedome.pdfIn PDF document text
    • https://cdn.sqhk.co/zagakobafot/Vjb0Mjb/truck_wallpaper_android_hd_abstract.pdfIn PDF document text
    • http://widalatipuna.22web.org/how_did_japan_grow_its_economy.pdfIn PDF document text
    • http://centerbluebadge.com/jigorevhmafx.pdfIn PDF document text
    • http://boomua.site/principles_of_instrumental_analysis_7th_editionk59fc.pdfIn PDF document text
    • http://jaxebememapi.iblogger.org/tekupevanorakiratubiro.pdfIn PDF document text
    • https://vebodejivab.weebly.com/uploads/1/3/2/3/132302978/735444.pdfIn PDF document text
    • https://natevifenug.weebly.com/uploads/1/3/5/9/135986161/6189201.pdfIn PDF document text
    • http://itanto.space/potiwugaxobukogepamok8qcts.pdfIn PDF document text
    • http://lnstagram-blue-badge-form.com/how_much_sodium_is_in_a_taco_bell_power_bowlsysgs.pdfIn PDF document text
    • https://legipulevigo.weebly.com/uploads/1/3/2/6/132695741/gideb-rinituxojiwi-pufunubem-jukof.pdfIn PDF document text
    • http://cccckkkkkdd.space/govasorijijivilodotexowun57bao.pdfIn PDF document text
    • https://cdn.sqhk.co/gobopovupav/ajjsjfT/edelweiss_sound_of_music_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/zegapoxasut/gihj1pC/28137987524.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sitiwaruto.rf.gd/statistics_for_management_and_economics_11th_edition_solution_manual.pdfIn PDF document text
    • http://zaxuzut.atwebpages.com/11270775195.pdfIn PDF document text
    • http://xijewixevav.onlinewebshop.net/81752430112.pdfIn PDF document text
    • http://nanaxidimidi.atwebpages.com/pdf_book_maker_free_download.pdfIn PDF document text
    • http://xitutudatiri.epizy.com/interview_weakness_and_strength_answers.pdfIn PDF document text
    • http://dafudezukixoz.epizy.com/birdy_skinny_love_piano_sheet_music.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_off0000dbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDC 5452 bytes
SHA-256: 62abfad43e8a44cb0322535557c4696ea826f40e54fa990532a3048fe600ab8c
font_01_sfnt_off0000ee47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE47 12804 bytes
SHA-256: 7de1da30717fdfd74ec0fb0ae52c72d27ac83ad64d1a89017c2311be67a68e7a