Malicious PDF — malware analysis report

Static analysis result for SHA-256 50e46c9be1f89938…

MALICIOUS

PDF

75.4 KB Created: 2021-01-24 22:19:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 439d162cc636620d44dfe6525052c221 SHA-1: 9b31c7557d8c7acfe76becee0f4559f65b9a80af SHA-256: 50e46c9be1f8993830753b190e3c3ce4861e5c6ea104e14518e130b8ceffa3bf
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

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://trafffi.ru/123?utm_term=charlottesville+high+school+track PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469852/normal_5fe65f01aaa90.pdfIn PDF document text
    • https://mateboxabivof.weebly.com/uploads/1/3/4/7/134763458/4898197.pdfIn PDF document text
    • https://lurevovikofa.weebly.com/uploads/1/3/4/6/134693735/9686692.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472776/normal_600aa9359d22c.pdfIn PDF document text
    • https://pogudemuzam.weebly.com/uploads/1/3/4/0/134018755/vinazakovamako.pdfIn PDF document text
    • http://nefuwumimo.iblogger.org/dispositivos_oxigenoterapia.pdfIn PDF document text
    • https://bagirarivevi.weebly.com/uploads/1/3/1/3/131384609/zazukenese.pdfIn PDF document text
    • http://immorta-cross1.club/jufan2vc9v.pdfIn PDF document text
    • http://health2health.online/16525210439fxl3f.pdfIn PDF document text
    • http://gulebamabixaku.22web.org/shayari_video_karna_hai.pdfIn PDF document text
    • http://velimafi.iblogger.org/48835957185.pdfIn PDF document text
    • https://taboxataxenigo.weebly.com/uploads/1/3/4/1/134108556/8731352.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/tiluwisulepam/deux_arabesque_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/3332429426.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/bihar_daroga_form_2019_last_date.pdfIn PDF document text
    • http://lafeseg.rf.gd/78097185071.pdfIn PDF document text
    • http://zubeleboju.epizy.com/business_letter_template_on_letterhead.pdfIn PDF document text
    • http://bovuzigaratufob.rf.gd/34652951885.pdfIn PDF document text
    • http://pitefabe.epizy.com/exploiter_orb_fight_guide.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_off0000ea23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA23 5092 bytes
SHA-256: 2551adde2fab7efe55e47185f951a6ee3ac84e4f18a2f84ee8d4f8bc93155bbb
font_01_sfnt_off0000fb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB73 10808 bytes
SHA-256: 657beb734fab392a8dddf370c2120d6c06e159cdb5bb964791690586486b9adb

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