Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5bcff9806ccc770…

MALICIOUS

PDF

110.5 KB Created: 2021-05-08 20:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1f344329c79c56745c3cd804721f6b5e SHA-1: a7e40e5e4fa5eb77e6e83320582eb5986e003cde SHA-256: c5bcff9806ccc770b2555f1a4d07640812a5152c0481d7a269b3f944a5475f46
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, and contains numerous embedded URLs. The document body, though heavily obfuscated, appears to reference 'Matlab download free student 64 bit windows 7', suggesting a lure for software downloads. The presence of many external URIs and the 'link farm' heuristic indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xajibur.ru/strik?utm_term=matlab+download+free+student+64+bit+windows+7 PDF link annotation
    • http://visionnew.xyz/51548107843o6uge.pdfIn PDF document text
    • http://fredo.run/881976855281sykk.pdfIn PDF document text
    • https://cdn.sqhk.co/zisubiziwu/cjfBmvB/pamebefodebipotural.pdfIn PDF document text
    • http://tosety.xyz/dihybrid_punnett_square_practice_problems_with_answersizbp8.pdfIn PDF document text
    • https://cdn.sqhk.co/migazajigum/jcDAPid/70449119623.pdfIn PDF document text
    • https://cdn.sqhk.co/pisomuma/xjbOUoT/photo_editing_change_background_software.pdfIn PDF document text
    • http://matrixbicycles.com/sonic_utopia_download6x9ed.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/ihjcajf/73653117439.pdfIn PDF document text
    • http://smartcoin.design/vector_full_apk_indirljm52.pdfIn PDF document text
    • http://unlockdeals.shop/ruvekeforanivulavcgdhl.pdfIn PDF document text
    • http://xabidewukolesas.66ghz.com/68999524197.pdfIn PDF document text
    • http://gratoramm.website/florence_scovel_shinn_affirmations_for_success6it2q.pdfIn PDF document text
    • https://cdn.sqhk.co/pokemazikera/aigm7RU/15634231730.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://soxekig.epizy.com/46544939479.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/94789088912.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95a703fa-f20d-4de6-9bbf-38aba82bdcd0/kijalibimiwevuvozinebiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de05e77b-7242-44dd-834e-43e7bc2a03b2/tin_tin_restaurant_prices.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/bivamokifatoriraturox.pdfIn PDF document text
    • http://sejonigimanam.epizy.com/mikaromexarida.pdfIn PDF document text
    • http://devugagevubuz.rf.gd/chemistry_project_for_class_12_cbse_on_food_adulteration.pdfIn PDF document text
    • http://kutugujipix.epizy.com/62019667332.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/king_platform_bed_design_plans.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_off000170d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170D6 5460 bytes
SHA-256: 92ed2742702d6d5d82f8b6454a39c8440a9ac581c18426a838dfa882ae58164b
font_01_sfnt_off000183a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183A3 11900 bytes
SHA-256: cc5f3b3d16b5e59e95327e6e12ba7fbb86d7f350e624a02e919390df43704c8f

Open this report in the interactive analyzer, or submit your own file for analysis.