Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ea701ff5adaa2b…

MALICIOUS

PDF

77.5 KB Created: 2021-03-01 12:15:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: b802c6faa8b6f6c70039d3c94efc40b8 SHA-1: b8c5cc668af21b6e2431d3cde049ab9421abd25e SHA-256: 79ea701ff5adaa2b54f66cf09f930fcf9b1d9bc70b88d09a7af01bad7ad33646
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and the 'link farm' heuristic point towards the document being used to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://soxebez.ru/wix?keyword=similarities+between+plant+and+bacterial+cell PDF link annotation
    • http://instapriz365.site/pikemelufb9e.pdfIn PDF document text
    • http://komujevakikumu.22web.org/mediaget_free_for_windows_10.pdfIn PDF document text
    • http://uablog.website/changer_ecran_kobo_cassqyquf.pdfIn PDF document text
    • http://rukozhop-guide.com/kenmore_chest_freezer_model_253_manualqiz2d.pdfIn PDF document text
    • http://winepazijabubov.22web.org/ohaus_scout_balance_manual.pdfIn PDF document text
    • http://wotuxolis.iblogger.org/9665302955.pdfIn PDF document text
    • http://ruszaimclub.ru/plantronics_legend_reviewfaetf.pdfIn PDF document text
    • http://abwaab.su/1_8_architectural_scale9lyfp.pdfIn PDF document text
    • http://1green.space/roblox_shinobi_life_codesc1ks8.pdfIn PDF document text
    • http://xinupavob.iblogger.org/37142484598.pdfIn PDF document text
    • http://vknart.xyz/sonifepu2a6mk.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/wujodibu/tv_guide_magazine_ncis.pdfIn PDF document text
    • http://zegemipufe.epizy.com/armaflex_foam_sheet_insulation.pdfIn PDF document text
    • http://nexuvojof.epizy.com/gilefubafoturajas.pdfIn PDF document text
    • http://dukoloxanad.epizy.com/battery_tender_-_agm_1200_amp_jump_starter.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/eau_guidelines_bladder_cancer.pdfIn PDF document text
    • http://xamojivegubon.epizy.com/96683394909.pdfIn PDF document text
    • http://begagujimuro.epizy.com/27007328319.pdfIn PDF document text
    • http://kolenexe.epizy.com/37452463770.pdfIn PDF document text
    • http://ritarajekaxitev.rf.gd/82151675117.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/to_my_dear_and_loving_husband.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_off0000f266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF266 5556 bytes
SHA-256: c14c8c23050d8d6df3dc231a4dbc0b996671959b7eba84060e452f8ec6f11166
font_01_sfnt_off00010537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10537 10244 bytes
SHA-256: e602893c0d19183bcab3cccadd8a644c8237a5a52d0ba2abda6088afbf91a1c5

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