Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b7c91bddec793f…

MALICIOUS

PDF

75.7 KB Created: 2021-05-23 02:41:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 90b8a4b7a3b2c48c11fcface366c01e5 SHA-1: 657fe4be8bbdb407d0b0c88d1ed87af37bd2a75e SHA-256: 43b7c91bddec793f2ca33473473bf9771c892ddb5f29c9154958d1ed20380363
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, with a critical heuristic firing for ClamAV detection. It contains an embedded URI pointing to 'maypoin.ru', which is likely part of a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to trick the user into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/strik?utm_term=tcl+tv+code+for+rc122+remote PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376598/normal_603c50ced23a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479673/normal_605885ad7d7e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460688/normal_5fcbd6c3597ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409095/normal_5fe82d9bec651.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412570/normal_601833063c9ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407795/normal_601a37b469d35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373797/normal_6057fc026aa58.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e80332d-aa42-4e6b-84a0-630815d7f5e4/solidworks_simulation_2016_a_tutorial_approach.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95b02fa2-4b65-40fc-b243-fbc503848320/fosukazage.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/vintage_video_games_play_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4531c19a-bc08-4676-93b5-85d75db1291b/dell_t3500_workstation_smps_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdfc913b-fa8f-441d-977e-3ba9e8519fb7/what_size_screws_do_i_need_to_mount_my_samsung_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db1e4e83-a72f-45e1-893a-46ecfcce98f7/33191299163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7df9e9c8-aa43-4a3e-9e0c-1b98ff49bb16/29775712695.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/wakonezebokopu.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/xosikoxawoler.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da264a0c-81af-44b4-89be-c8970b4c378c/1584616329.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/vexoxasowizakininezutari.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/15939090476.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82ba05ef-736a-4271-9d1e-765984c780f8/bunad.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/fejovusitigipirovi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df89279a-e947-403f-a4d5-927939e8d8a2/80181310390.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/92214692571.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/harry_potter_calice_de_fogo_mega.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_off0000eba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA1 4972 bytes
SHA-256: b7cf13530ed8e5502cf510eeea17f82aad20d4ead3f3cd7f903fcd65b3d62dc9
font_01_sfnt_off0000fc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC88 10760 bytes
SHA-256: 809b8c0bb963367e00241ff4b4e70831be91f9c15b5e1a09a10a23064769e530

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