Malicious PDF — malware analysis report

Static analysis result for SHA-256 baa33c2a632635d1…

MALICIOUS

PDF

65.5 KB Created: 2021-02-11 15:30:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 707dd7833c674c8aa5cbc0473bd56e38 SHA-1: 3448366bcfe7f4a00791e3bdf5e15945a782b07e SHA-256: baa33c2a632635d126dc9526fe5676e499fed74ecc3799e97e4d0a66a58ced28
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to 'jacksth.ru', which is likely part of a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=metal+activity+series+table PDF link annotation
    • https://cdn.sqhk.co/kugorazig/ij3hbig/98877563191.pdfIn PDF document text
    • https://cdn.sqhk.co/bamikalagov/aijbOsy/drop_down_off_synonym.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454671/normal_60236555906f9.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/PhhhQih/total_net_carbs_for_ketosis.pdfIn PDF document text
    • https://cdn.sqhk.co/tinupolureg/jgShjgi/93566723487.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450514/normal_600e3871a7c78.pdfIn PDF document text
    • https://cdn.sqhk.co/nilamemiw/jgibJgf/black_male_single_braid_hairstyles.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wowonesoribu/51595629044.pdfIn PDF document text
    • https://s3.amazonaws.com/taguxif/jaws_theme_sheet_music_tuba.pdfIn PDF document text
    • http://xuwanozofugis.epizy.com/aviva_asia_annual_report.pdfIn PDF document text
    • http://wijogural.epizy.com/juram.pdfIn PDF document text
    • https://s3.amazonaws.com/posaxugidut/wobepupuwiburatapade.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/json_formatter_plugin_for_notepad.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/capability_statement_consulting_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/naija_r_b_dj_mix.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/89708648042.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/swimlane_flowchart_template_excel_free.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_off0000c50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC50C 5100 bytes
SHA-256: 76fb8046d5daa8d85fdd2a40e0bde4aee31f5b2fe51cb99e0bbe2d85068433c9
font_01_sfnt_off0000d68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68F 10160 bytes
SHA-256: ea8cb28e710e788cfb5b939b162c6c5ea50d83f9c226a4809fa91a31465e9e1c

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