Malicious PDF — malware analysis report

Static analysis result for SHA-256 438e8f667441e513…

MALICIOUS

PDF

77.4 KB Created: 2021-04-23 02:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6787bf0b40495a8a640bb7ff77d25ca9 SHA-1: e2e886ec1248de56c71b65fc2ee3336fbd3de7fe SHA-256: 438e8f667441e513b82521e9ec7e6fc2e8715872813ac3d2c981d8849a52f2bb
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 of which point to disposable domains or subdomains, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the distribution of malicious content or manipulation of search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://maypoin.ru/strik?utm_term=english+literature+online+reading PDF link annotation
    • https://cdn.sqhk.co/tovozovuzedu/bghgcHs/pukesagaxivizate.pdfIn PDF document text
    • http://lnstagramverifiedbadgeshelpcenters.net/shrek_2_torrentay6ty.pdfIn PDF document text
    • http://womenit.space/apostasy_report_the_fall_of_calvary_chapel9u49u.pdfIn PDF document text
    • https://cdn.sqhk.co/mafowixodi/bPgigjn/best_mp3_voice_recorder_app_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/vDuhdic/throne_of_glass_quotes_rowan.pdfIn PDF document text
    • http://xodesat.22web.org/speciation_definition_biology.pdfIn PDF document text
    • https://cdn.sqhk.co/koxuzofu/caVijeE/rolling_sky_mod_apk_2019.pdfIn PDF document text
    • http://bitsracing.net/cuanto_son_3_pies_y_8_pulgadas_en_centimetros1liy9.pdfIn PDF document text
    • https://cdn.sqhk.co/reserujaj/igiJeCg/pancake_artistico_onde_comprar.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzosexiwugu/JZhjidx/police_chase_los_angeles_live.pdfIn PDF document text
    • http://7gusevshop.website/pexesndhuw.pdfIn PDF document text
    • https://cdn.sqhk.co/xovujiroveg/ikhbii3/36113124215.pdfIn PDF document text
    • http://storeyou.store/how_to_renew_autodesk_student_licenseaa5uz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://benepuru.epizy.com/ccie_sp_lab_workbook.pdfIn PDF document text
    • https://e064a861-6c7b-46af-b67a-66be1f32d776.filesusr.com/ugd/ec3e4b_7d681fe4bcfc449b922e4880ca9f733a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/biennial_profit_corporate_report_new_mexico.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/xenetulorewowusoku.pdfIn PDF document text
    • http://wenerimul.rf.gd/understanding_business_organisations.pdfIn PDF document text
    • https://s3.amazonaws.com/wakuzidi/text_image_maker_online_free.pdfIn PDF document text
    • https://d4996ccb-aecf-47c4-aab6-3c4fe022e1b7.filesusr.com/ugd/b7ed05_a709d9f5a3a34f21a7cf9bd9cd26cd90.pdf?index=trueIn PDF document text
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_c9cc0392d3604ebc924e6c34803f5a3a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/80661534710.pdfIn PDF document text
    • http://vukenebavez.rf.gd/98839626584.pdfIn PDF document text
    • https://7722bba5-72ad-4d15-a72d-9ce9fbdcf1b5.filesusr.com/ugd/772ad5_eb7580d0d4804c6ca3dbd63830e4483b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/how_to_use_excel_multiply_formula.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_off0000f339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF339 5044 bytes
SHA-256: 13493033db30690fbd4d0291d86e9d4eb2b289f8de1de402654ead52bcb5cc38
font_01_sfnt_off00010458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10458 10504 bytes
SHA-256: 9dfee8debc0e444c23a5063275643d2a1ba861f1f3a76cc7264c933c4842664e