Malicious PDF — malware analysis report

Static analysis result for SHA-256 f023fa4c21fd0fe9…

MALICIOUS

PDF

76.3 KB Created: 2021-04-06 19:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 53037271206e3e0b55397728a73cb44c SHA-1: a9bcb8e83f9bdabfefd68eda50f7eecb9c16b4b0 SHA-256: f023fa4c21fd0fe90a25cff2c7fe48c12533348db13046a27c36cb158b4e0ef6
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many pointing to disposable hosting, and is identified as a link farm. The document body is heavily obfuscated and appears to be malformed, but the presence of external links suggests an attempt to redirect the user to a malicious site, 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://pelibifir.ru/strik?utm_term=how+to+draw+p%2526id+diagrams+in+visio PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477864/normal_604bc2753bf9b.pdfIn PDF document text
    • http://ridovise.sportsontheweb.net/gallbladder_polyp_guidelines.pdfIn PDF document text
    • http://dontbeshy.xyz/82626616986pvtru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459479/normal_600b4a26ab2f4.pdfIn PDF document text
    • http://zofunubesosena.mypressonline.com/57157215564.pdfIn PDF document text
    • https://gatuxarujesij.weebly.com/uploads/1/3/5/2/135296766/gewetijibet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480897/normal_6003f55db7b9c.pdfIn PDF document text
    • http://idealicaitaly.site/midsummer_nights_dream_translation_act_2_scene_104q7d.pdfIn PDF document text
    • http://vodabutopidaru.getenjoyment.net/22452756315.pdfIn PDF document text
    • http://googsnat.space/cml_treatment_guidelineqtg94.pdfIn PDF document text
    • https://wusitezuredov.weebly.com/uploads/1/3/5/3/135314125/7636185.pdfIn PDF document text
    • http://biotringel.shop/moto_g_2nd_generation_back_cover_flipkartp1yx8.pdfIn PDF document text
    • http://merovew.xyz/molecular_biology_of_the_gene_7th_edition_by_james_watsongibid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412887/normal_6000638d01a71.pdfIn PDF document text
    • https://nolelagisumo.weebly.com/uploads/1/3/4/1/134132353/lurere.pdfIn PDF document text
    • http://lirifajo.sportsontheweb.net/gusajuwas.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/sezewu/bootstrap_4_gallery_template.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/history_of_reservation_policy_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/fugue_in_d_minor_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/remington_50_kerosene_heater_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/300_blackout_180_gr_subsonic_load_data.pdfIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/hollywood_the_dream_factory_an_anthropologist_looks_at_the_movie-makers.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_off0000ee50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE50 4796 bytes
SHA-256: a84cbf96dd47c518e244e2386136bb244d4708378d7f8fe44c56c5cb652daaf2
font_01_sfnt_off0000feba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBA 10612 bytes
SHA-256: d526aed3acb7c72030979c077bdc855f1692e04da17d4cc4e785226765ce52de

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