Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c128a6264ce6c5…

MALICIOUS

PDF

74.3 KB Created: 2021-02-25 21:07:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7f78b90ef7459e403aaf445c5bd39d76 SHA-1: 1c5f783197f88fc0bc474893bbe7c6923dc476fc SHA-256: f4c128a6264ce6c58b221f2707cf8a01ed523787897aae0ac60265f9d929957f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/wb?keyword=after%20we%20fell%20book%20summary%20spoilers PDF link annotation
    • https://cdn.sqhk.co/gotulurowav/TfjjHie/30127182352.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427300/normal_5fee61f01a5fb.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/how_can_i_post_a_video_on_facebook_without_copyright.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485451/normal_602e21bba7074.pdfIn PDF document text
    • http://consumer-data-protection-bureau.com/votinumozix4boaf.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/iggOhjD/ants_life_cycle_worksheet.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/around_the_world_in_80_days_full_movie_in_hindi_filmyzilla.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447267/normal_600132e2ec077.pdfIn PDF document text
    • https://tekuxarutupun.weebly.com/uploads/1/3/0/7/130775258/3524519.pdfIn PDF document text
    • http://lovepositions.info/te_modes_in_rectangular_waveguide_ppty1bpm.pdfIn PDF document text
    • http://laithub.pro/parrot_ck3100_manual_utilizarexk2kt.pdfIn PDF document text
    • http://makeyourself.xyz/does_costco_sell_resound_hearing_aidshqmk9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495973/normal_5ff8056536c58.pdfIn PDF document text
    • http://tafugegajotu.mygamesonline.org/how_to_use_one_touch_verio_blood_glucose_meter.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/kukupunopedon/flanders_conference_hotel_ielts_listening_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/eye_test_report_snellen_chart.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/is_cbr2f2_polar_or_non-polar._explain.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/bebe_care_ole_bedside_sleeper_sheets.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_off0000e35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35C 5432 bytes
SHA-256: 144085bb43892e5ae0269b9ae3495b9652ce50b347d169b4e3204cc068ae54b5
font_01_sfnt_off0000f5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D7 11372 bytes
SHA-256: 2a4583de811d3213c2fb762312daf9c5a5d0954e3e2ad9792d017c11635ca21c

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