Malicious PDF — malware analysis report

Static analysis result for SHA-256 793056c64cec8e08…

MALICIOUS

PDF

75.1 KB Created: 2021-03-30 16:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ab30cfde68d3482231c9e1a7fc6c80a8 SHA-1: 47214e55568f8a9a22eedac66839a0a557ff0b55 SHA-256: 793056c64cec8e08cecb9db119d7235aa03f523c770886850ace740c0023f0a7
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 embedded URLs, with at least one pointing to a disposable hosting domain, indicating a link farm designed to redirect users to potentially harmful sites. The document body, though heavily obfuscated, suggests a technical pretext related to HTML/CSS, which is likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://seumenha.ru/strik?utm_term=html+css+table+max+column+width PDF link annotation
    • http://luxuwum.mypressonline.com/mibakumabokebagom.pdfIn PDF document text
    • http://wivikaxebox.medianewsonline.com/how_to_charge_ion_sport_speaker.pdfIn PDF document text
    • http://notojubemeduxan.iblogger.org/probability_worksheet_gcse.pdfIn PDF document text
    • http://wumijodurixemi.22web.org/87355233025.pdfIn PDF document text
    • http://xuribof.medianewsonline.com/49650653771.pdfIn PDF document text
    • http://wadupobem.iblogger.org/taxibizexirisusixowij.pdfIn PDF document text
    • http://daposojur.iblogger.org/10014798079.pdfIn PDF document text
    • http://puxekera.22web.org/validity_and_reliability_of_research_tools_for_research.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kozifina.epizy.com/cetoacidosis_diabetica_2017_gpc.pdfIn PDF document text
    • http://wufizomofoduzin.rf.gd/8500270199.pdfIn PDF document text
    • http://tuwutexo.onlinewebshop.net/diferentes_tipos_de_aparatos_y_sistemas_del_cuerpo_humano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eef14e1-3e34-424c-b49a-a100727ebf80/is_the_hunger_games_book_appropriate_for_12_year_olds.pdfIn PDF document text
    • http://zuraravata.epizy.com/joint_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85a478b9-4957-45ae-868b-a175a66c6eb0/dirt_devil_featherlite_vacuum_bags.pdfIn PDF document text
    • http://rotilelas.rf.gd/kudaxoba.pdfIn PDF document text
    • http://sabulawum.rf.gd/applied_operations_research_for_management.pdfIn PDF document text
    • http://rovuwuruw.epizy.com/17981971212.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c257176c-ed31-4cd6-8239-e484d3e04486/gufogovevin.pdfIn PDF document text
    • http://gikiwajufekozi.rf.gd/zobifusame.pdfIn PDF document text
    • http://dijijesuwaxon.epizy.com/zexekevuwubijo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18a67251-baf1-4547-b940-44f22c75fa88/gua_oficial_dark_souls_3_mega.pdfIn PDF document text
    • http://ledufowi.myartsonline.com/9169092268.pdfIn PDF document text
    • http://rovututuxopi.epizy.com/harvard_classics_readers_guide.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_off0000e5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EF 5344 bytes
SHA-256: dc48a302ea8348ca5ca61fe2fc6f063d866f23a6ceb7b5481d4b66fa38c823c9
font_01_sfnt_off0000f804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF804 11492 bytes
SHA-256: 0116bc7e7cced1d5a1f3c6e8f13aceff091b5ffc577feea183f2523d1214eaae

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