Malicious PDF — malware analysis report

Static analysis result for SHA-256 bffdb0621b938eca…

MALICIOUS

PDF

86.7 KB Created: 2021-02-13 11:52:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: ab4ce54ea4897387ecceab3c79919608 SHA-1: e5cba38b7e300b9978c4680c3cb26116b4c19534 SHA-256: bffdb0621b938ecac6cb6b2e23714d3853033dc6e52f75f6e209a28b0b2a92b4
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV as a phishing trojan. It contains an embedded URL pointing to a suspicious domain, which is likely used to deliver a malicious payload or conduct phishing. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of the external URI and the high confidence verdict suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/123?utm_term=neutral+monism+schopenhauer PDF link annotation
    • https://cdn.sqhk.co/bilanogakiw/djM8k3g/opera_mini_fast_web_browser_old_version_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/QibfdKY/dining_table_chairs_set_of_6.pdfIn PDF document text
    • http://sportita.fun/xonaferupuxisedefezanog0xi33.pdfIn PDF document text
    • http://insurancesouk.com/13339560984okteb.pdfIn PDF document text
    • http://taptopbot.com/printable_self_certification_form_nhsjtmmr.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanekoxo/X0TehfZ/81903409249.pdfIn PDF document text
    • https://cdn.sqhk.co/rizakumer/Mgeibih/among_us_game_pc_online.pdfIn PDF document text
    • http://shoop-fr.ru/ebooks_download_sitesd4lra.pdfIn PDF document text
    • http://teleporttur.ru/sepsis_2018_definitions_and_guideline_changes0evnj.pdfIn PDF document text
    • http://ecoterritory.store/pisotevexuruwop2hetv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nilititonawafim/formule_pour_calculer_un_pourcentage_d_augmentation.pdfIn PDF document text
    • https://s3.amazonaws.com/kiremefegonar/add_microsoft_outlook_calendar_to_android.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/ravas.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/internet_manager_apk_for_windows_7.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C20 5024 bytes
SHA-256: 6d7d4e19b7bb537c77bf9e2861a25719916b7ffd85429f10d90c0fa6e519cca2
font_01_sfnt_off00011d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D02 10236 bytes
SHA-256: 88fbecad21a7c7ea15558db800aee5c735124f0d6610162781d7586a992a14bc
font_02_sfnt_off00014000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14000 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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