Malicious PDF — malware analysis report

Static analysis result for SHA-256 781b95ecddb5d57c…

MALICIOUS

PDF

80.4 KB Created: 2021-03-14 14:15:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2513804bf850ab5c686ff86607adc5dd SHA-1: 7a2cb93a822a7bd47e9fb7c74301d4b36cd5aa44 SHA-256: 781b95ecddb5d57c78bb02bc89e778bcc6ef25a70d8de4844c288cfb660b6baf
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URL that directs users to a site with a query parameter suggesting a lure related to study habits. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristic suggest it's designed to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=what+are+the+7+effective+study+habits
    • http://ttop-shop.com/152945530340d2lo.pdf
    • http://bumasujofoj.getenjoyment.net/focusrite_scarlett_solo_ableton_live_lite.pdf
    • http://idclick.cash/55421500926ql188.pdf
    • http://tideparipawovu.mygamesonline.org/fizirubabapironinujorudis.pdf
    • http://lbaranaydin.com/escape_room_level_148_answer_key1upfq.pdf
    • http://parrrtner.xyz/free_club_flyer_templates_psdfgjww.pdf
    • http://topmassage.net/pisotoxx6x.pdf
    • http://meetsucre.pro/capacitive_coupling_ethernet_transceivers_without_using_transformers1t063.pdf
    • http://fragcups.com/dyson_animal_vacuum_cleaner_brush_not_spinning183o4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kovozenamofox/apocalypse_world_2nd_edition.pdf
    • https://uploads.strikinglycdn.com/files/7494e211-dd37-4150-a311-555d34658303/dias_feriados_oficiales_2020_puerto_rico.pdf
    • https://s3.amazonaws.com/babetafaperaxov/ruvuwim.pdf
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_041aa2c58d374a98b1b4a84a3eb52063.pdf?index=true
    • https://s3.amazonaws.com/xepululejiwof/hokkaido_road_map.pdf
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_c9c6b0fdb9bb4d6ab83e9709fecb8930.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6225d389-b670-4f3b-85ed-d9c4b568dda8/chicco_fit2_base_vs_keyfit_30.pdf
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_b2af7588810b4f2ab966937e4d8306e4.pdf?index=true
    • https://1de4b56a-3309-4767-83a2-f1bb1ea7c594.filesusr.com/ugd/a6e5e9_68fec3083c304ddf89075fe1b3404d65.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5811e85d-149b-40d3-9855-54d9624a3500/zig_ziglar_sales_books.pdf
    • https://s3.amazonaws.com/viboxikuz/what_are_the_theories_of_learning_in_educational_psychology.pdf
    • https://uploads.strikinglycdn.com/files/6534c139-511a-4be7-b6bf-7349ac7c7ade/junamalabomopupewatumo.pdf
    • http://masemipeba.myartsonline.com/o_positive_blood_type_diet_to_lose_weight.pdf
    • http://xufolat.atwebpages.com/70872855583.pdf
    • https://aca56392-15ae-48e8-982c-fdf6c4ac0dc3.filesusr.com/ugd/00c070_2ef8d7fb0881411ca16d9c816a292a39.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbbf.bin
07cab4456daf56c0555dde880566a654f45974003ceb295a0e9bd4c833837d05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBF 5472 bytes
font_01_sfnt_off00010e74.bin
0e95d79ba42b2311833eb78c54328c1484300d86e33ac5b5ad5f01d74ac9e8f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E74 11048 bytes

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