Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e83723541ff9941…

MALICIOUS

PDF

82.9 KB Created: 2021-03-25 22:49:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a72fa0f3ef2099411505655edab82277 SHA-1: 4388a4bbf5c3bee3772f72e18077e3dd263f2d36 SHA-256: 3e83723541ff9941bd1672b3aed98c8fdf37517be485b05b04796f619a8b2c4d
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are dynamically generated and point to potentially malicious domains, indicating a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious content.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://lozipotod.ru/award?keyword=arduino+uart+tutorial+pdf PDF link annotation
    • https://wewiwefiwowofaj.weebly.com/uploads/1/3/4/3/134369931/bbd93f9ae2e.pdfIn PDF document text
    • http://vatasefapulik.iblogger.org/vmware_esxi_5._5_free.pdfIn PDF document text
    • https://guditeni.weebly.com/uploads/1/3/4/5/134529862/27bf55a42e4.pdfIn PDF document text
    • http://hookup671.site/washington_capitals_hockey_game_schedule82cmo.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/what_time_does_black_friday_start_at_walmart.pdfIn PDF document text
    • https://fowidejufato.weebly.com/uploads/1/3/4/5/134582967/8605020.pdfIn PDF document text
    • https://pavafilapaf.weebly.com/uploads/1/3/5/3/135306960/7ea1c6dd929.pdfIn PDF document text
    • http://faxusupovetek.sportsontheweb.net/is_indian_food_diabetic_friendly.pdfIn PDF document text
    • http://fodelogutejamit.getenjoyment.net/dujujakaneguzu.pdfIn PDF document text
    • http://shtangelkipokupkiitd.online/901350726390wj27.pdfIn PDF document text
    • http://onlinetiser.website/bradford_white_defender_water_heater_warrantyp1z8s.pdfIn PDF document text
    • http://arenaprobet.com/guedel_airway_size_guideg1b8k.pdfIn PDF document text
    • https://vinosubolab.weebly.com/uploads/1/3/5/3/135316207/8161904.pdfIn PDF document text
    • http://dehydratedoriginalgoodness.com/3268183420371ixm.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/zidenigad/tony_gaddis_starting_out_with_java.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/dhamak_bass_song_djpunjab.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/58001218371.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/mikuni_vm_tuning_guide.pdfIn PDF document text
    • http://zalupadinukoz.rf.gd/86359025636.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/how_to_adjust_bobbin_tension_singer_simple.pdfIn PDF document text
    • http://suwetiwojiza.rf.gd/ciencias_ambientales_uam.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_off0001093f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093F 4848 bytes
SHA-256: f020629e6f8f3b329ea8ccdd69c424eb6c7a5855e5784b391762c4780676820a
font_01_sfnt_off000119cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CC 10608 bytes
SHA-256: 79481befdca3f407f6fd8c2f27481ff1f7d498311ffd881c377b220a43262c6e

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