Malicious PDF — malware analysis report

Static analysis result for SHA-256 41bcbe3aecd45203…

MALICIOUS

PDF

81.4 KB Created: 2021-05-11 08:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6d29fdd2b97e82698962263e8b5e6594 SHA-1: 3ee33349ccd3d2783b8b891ab0ddf210d991111f SHA-256: 41bcbe3aecd4520370657e25429ffd29cebb3708315ca06f6bde8bea932c36a2
146 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host many links on potentially untrustworthy sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://botokaw.ru/strik?utm_term=stock+market+hours+mlk+day+2021 PDF link annotation
    • http://theboldpantsproject.com/firigozifox1d2uu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402250/normal_602feb3a47f37.pdfIn PDF document text
    • https://cdn.sqhk.co/bofimekowadu/Hhi8isz/buscar_mi_telefono_android_robado.pdfIn PDF document text
    • https://cdn.sqhk.co/wizokawoxo/6Ujfjgn/xusudem.pdfIn PDF document text
    • http://good-production9.site/64142049858dx5mi.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/PibLjcP/clothes_worksheets_clipart.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408858/normal_6058c91dee126.pdfIn PDF document text
    • https://cdn.sqhk.co/xipepovivik/ebifhca/38819525148.pdfIn PDF document text
    • http://3gusevshop.space/56600129913gy9d5.pdfIn PDF document text
    • https://cdn.sqhk.co/gozolijitow/Paljh3K/59914559165.pdfIn PDF document text
    • http://idealslimitalia-ufficiale.site/240441157031vpvd.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/Wc9hcXu/minecraft_servers_pe.pdfIn PDF document text
    • http://doweryklkq.space/how_to_set_up_voicemail_on_panasonic_landlinehjtme.pdfIn PDF document text
    • https://cdn.sqhk.co/dasofuduveje/dvZd1lU/wusigidenuj.pdfIn PDF document text
    • https://cdn.sqhk.co/takivelalam/vdk6phb/relufejewif.pdfIn PDF document text
    • http://inmyshtangen.xyz/what_is_the_diamond_sutra_aboutt6osg.pdfIn PDF document text
    • http://datinge.site/scenario_lyrics_tribe0agi9.pdfIn PDF document text
    • http://topstop.site/stanley_fatmax_led_tripod_lightwrxwu.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://uploads.strikinglycdn.com/files/d8e6136f-3b61-4191-80b4-0fb6d7d3bf47/vanikumulubi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41b3b535-ce4b-4f3d-8a16-3ec682724299/producer_to_producer_externalities.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf6e53a0-b536-40a5-a75d-eb92cc5e92b0/95967563177.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_off0000f063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF063 5504 bytes
SHA-256: 8bfb8be52efc752cc3f964ec5d0bf090ead44844ddf0caf1ab6a9d24a0f35c98
font_01_sfnt_off00010314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10314 11552 bytes
SHA-256: 70c2394ac26da5e22a95a72e6ace10dab6116e3ecee47bb3be0747e4aa20c01c
font_02_sfnt_off00012a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A46 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e