Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d34be7e745e72d1…

MALICIOUS

PDF

79.0 KB Created: 2021-02-27 23:38:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e5730afe1c2a3aa4c5591ad649b2637b SHA-1: 9ea8f7d83507a193d072dea6896c7088cd359197 SHA-256: 4d34be7e745e72d1359a1c512c86ecc65bf7dc106d78437b417ebf1047c299ba
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, specifically 'https://yafferge.ru/wix?keyword=georgia+milestones+5th+grade+social+studies+study+guide'. Heuristics indicate the PDF is a link farm on disposable hosting, and ML classifiers strongly flag it as malicious. The document body, though obfuscated, suggests a lure related to educational materials, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=georgia+milestones+5th+grade+social+studies+study+guide In PDF document text
    • http://cupe1.ru/who_owns_the_1001_nights_diamond_purse_by_house_of_mouawad_3.8_milliond74um.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387427/normal_5fd73a76a3119.pdfIn PDF document text
    • http://chempion.coffee/table_tennis_racket_bag_priceyaw9r.pdfIn PDF document text
    • http://segepivo.22web.org/firab.pdfIn PDF document text
    • http://nopotaz.medianewsonline.com/224622671.pdfIn PDF document text
    • http://gewebud.22web.org/93930008172.pdfIn PDF document text
    • https://zifokodogip.weebly.com/uploads/1/3/1/3/131398222/mijaduzi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426270/normal_5fd8d5a11fe25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393635/normal_600b2d3453a1d.pdfIn PDF document text
    • https://fumujalepobuxav.weebly.com/uploads/1/3/0/8/130813876/pinilekufumaxofufere.pdfIn PDF document text
    • https://jemusutagutuf.weebly.com/uploads/1/3/5/3/135390091/jezipow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lajofekozorofa.rf.gd/48242993122.pdfIn PDF document text
    • http://sazuronami.epizy.com/495446365.pdfIn PDF document text
    • http://widafasamuj.epizy.com/html_tags_table.pdfIn PDF document text
    • http://nuluwajewugutik.onlinewebshop.net/witcher_timeline_books_vs_games.pdfIn PDF document text
    • http://wuzatefiroko.epizy.com/bleach_vs_naruto_free.pdfIn PDF document text
    • http://xowobovu.myartsonline.com/concepto_de_modo_de_produccion_asiatico.pdfIn PDF document text
    • http://fopaguduvogo.rf.gd/4381669622.pdfIn PDF document text
    • http://tuwutexo.onlinewebshop.net/free_carpentry_books_online.pdfIn PDF document text
    • http://pimizebogo.rf.gd/free_loan_amortisation_spreadsheet.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_off0000f77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77C 5608 bytes
SHA-256: 84d2e2d8ab303f1d461b57dcd4e1ea9cebfd60c315205f89a302bee06ede18f7
font_01_sfnt_off00010a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A72 10412 bytes
SHA-256: 2aee06cc8e26685def522a6b244f8836f5e17125139bfa1f298a61d3754e8efc

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