Malicious PDF — malware analysis report

Static analysis result for SHA-256 5697b1a4300f0835…

MALICIOUS

PDF

81.8 KB Created: 2021-03-02 09:43:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 653128e1d31be2e1058a0237ba76dd61 SHA-1: fdde897b4f7004604a090d3687634947150cc6ab SHA-256: 5697b1a4300f08356a85ecc4272a4a1709f7d0185eaf033b8b30e907be78dade
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and employing UTM parameters, strongly suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/strik?utm_term=bluetooth+energy+consumption+ieee+standard+802.15 PDF link annotation
    • https://cdn.sqhk.co/dinigivo/cnDa7AQ/wood_spool_craft_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/vivijuzajus/q3jbthb/lubosiwasipaxarulojuwivi.pdfIn PDF document text
    • https://cdn.sqhk.co/jalafimimodo/qjagcjc/race_time_to_pace_converter.pdfIn PDF document text
    • https://cdn.sqhk.co/toviranevu/gcqU7ha/63124204155.pdfIn PDF document text
    • https://cdn.sqhk.co/dugixikisim/h6AAPlo/wordpress_admin_login_page_not_available.pdfIn PDF document text
    • https://cdn.sqhk.co/fofateze/jdgjGLv/19825406820.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/ifgjeid/nichi_collage_stories_maker_apk_premium.pdfIn PDF document text
    • https://cdn.sqhk.co/sovanoniwuva/xe5zhaS/download_jungle_heat_mod_apk_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/zofagopipowi/RRiejc4/94110135741.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415525/normal_60094f3970b45.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://towilisok.epizy.com/chocolate_movie_in_tamilrockers.pdfIn PDF document text
    • http://pogifovemujure.epizy.com/jotaro_s_theme_sheet_music.pdfIn PDF document text
    • http://tipopetudigovib.epizy.com/adventure_island_4_mod_apk.pdfIn PDF document text
    • http://xojabujujipeze.rf.gd/zapetadefepetug.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/wofatinugiwavosikojafome.pdfIn PDF document text
    • http://rosudera.epizy.com/assam_tet_guide_book_2019.pdfIn PDF document text
    • http://bodotekufuw.rf.gd/commercial_proposal_email_template.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_off00010102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10102 6312 bytes
SHA-256: 8a585eeed2bbd293ebf626f4d283d09cdea5f4129c132e0f1b84130acdcb98a6
font_01_sfnt_off00011661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11661 10252 bytes
SHA-256: 5e66218fee1c5b38db2425d1c8c063c113243b9e28d1a862d0be80b6d2c0892f

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