Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4b7b2585d67ba1…

MALICIOUS

PDF

94.6 KB Created: 2021-05-04 15:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d3d85e3e94086cf10b83107b7c7f0c5f SHA-1: 7847f9bc3ec0f9a2916219df1f82e8e1ad465139 SHA-256: ac4b7b2585d67ba1d9968e6da169cf3f1999853d2fccba8b5fd48ccb3790250c
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs, many hosted on disposable domains or link farms, suggesting a phishing or malware distribution campaign. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a focus on directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://resalured.ru/strik?utm_term=shadowrun+snes+wikipedia PDF link annotation
    • https://cdn.sqhk.co/nebuneduzib/igNjjqu/1404107958.pdfIn PDF document text
    • http://zosazufinur.mygamesonline.org/near_death_experience_research.pdfIn PDF document text
    • https://cdn.sqhk.co/gubisagebuto/6ghfwif/zombie_vs_fruit_plants_apk.pdfIn PDF document text
    • http://bawazofo.getenjoyment.net/gebugimokexedajawafa.pdfIn PDF document text
    • http://vijofudevadotar.mywebcommunity.org/bitox.pdfIn PDF document text
    • https://cdn.sqhk.co/xotalawad/jfibPmM/4_methods_of_formally_amending_the_constitution.pdfIn PDF document text
    • http://mivegik.mygamesonline.org/26553808709.pdfIn PDF document text
    • http://kafikiwamavo.22web.org/printable_burlap_banner_template.pdfIn PDF document text
    • http://limowoduramu.iblogger.org/peter_pan_2003_script.pdfIn PDF document text
    • https://cdn.sqhk.co/pemazekefise/kjjaMGj/bunewixi.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/patilawasu/51186669777.pdfIn PDF document text
    • http://modedavap.epizy.com/rent_agreement_format_in_word_for_house.pdfIn PDF document text
    • http://dexidije.epizy.com/bonetti_magnetic_level_gauge.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/guide_du_routard_thailande_2019.pdfIn PDF document text
    • http://kapilijugewi.rf.gd/ruzigolirolekizabu.pdfIn PDF document text
    • http://setuvufijub.epizy.com/2534587716.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/academic_performance_of_students.pdfIn PDF document text
    • http://rajiwewovipu.epizy.com/hot_songs_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/zezurirovaf.pdfIn PDF document text
    • http://nubibubimalepik.atwebpages.com/araceli_ordaz_revista_h.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/47051793231.pdfIn PDF document text
    • http://faxupinunuwup.epizy.com/andhra_pradesh_railway_station_codes.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/barrett_s_oesophagus_australian_guidelines.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D7 2952 bytes
SHA-256: cb9072f881c1fe0ad8900bbcc5a20a23fabb306412f64e001cac76c2a9509f2c
font_01_sfnt_off00011366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11366 5276 bytes
SHA-256: ddb02a4e7dca930d9e663609ed24010f480897e54f29ae60eae2daf26f25654a
font_02_sfnt_off0001255d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255D 2188 bytes
SHA-256: b672ed32057b611730be586441f877a1b206a236b78c91f14c1564547a1c78c7
font_03_sfnt_off00012f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F64 11476 bytes
SHA-256: 8dfc232bdbcd602776b5bad116e389b1415310b069d2b9fb2239b16b563ec252
font_04_sfnt_off00015692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15692 16208 bytes
SHA-256: f76e53b1165c770ea72ceccb5e808e1d48d2b426d0b5e274530350a00bad707e