Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb51c297ce98ae3…

MALICIOUS

PDF

74.0 KB Created: 2021-02-27 22:34:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f6def621df9147c9bc62827496c4d11d SHA-1: efd1e1f28920491611a3c255b8f00598bdf63818 SHA-256: dfb51c297ce98ae36c41635f803a6e44659e6b15bb257b377d8d84a91298584d
126 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to various domains, suggesting a phishing or malware distribution campaign. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/award?keyword=d+%2526+d+hot+dogs+menu PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454988/normal_5fe5ffd095247.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387815/normal_602b37b8de651.pdfIn PDF document text
    • https://cdn.sqhk.co/jujifefa/hjgdibU/genevukesoxosugewezofitu.pdfIn PDF document text
    • https://cdn.sqhk.co/zulatobi/1Qwjgia/fesanezojepubumi.pdfIn PDF document text
    • http://fobativ.mywebcommunity.org/75997259621.pdfIn PDF document text
    • https://cdn.sqhk.co/libobivole/Mgcgght/monster_hunter_rise_release_date_xbox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470979/normal_601fe00a80d8a.pdfIn PDF document text
    • https://cdn.sqhk.co/pukazibat/hg8gjbd/age_of_war_4_game_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426271/normal_5fdb19a28b889.pdfIn PDF document text
    • http://mailedflkf.site/jigibuso8ncif.pdfIn PDF document text
    • http://gilumesu.mypressonline.com/67570338116.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/sojofo.pdfIn PDF document text
    • http://helplnstagramoffice.com/10.sC4B1nC4B1f_palme_kimya_soru_bankasC4B1n91go.pdfIn PDF document text
    • http://scandisvet.ru/remasewg71n.pdfIn PDF document text
    • http://metryck.info/what_does_the_word_hadith_mean1pheh.pdfIn PDF document text
    • https://cdn.sqhk.co/lobinazema/NjdrJ4T/56324376400.pdfIn PDF document text
    • http://rubewox.sportsontheweb.net/farberware_food_processor_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/jivaduzar/ciM1Jic/underground_arts_philadelphia_pa_us.pdfIn PDF document text
    • https://cdn.sqhk.co/ludukuni/5mThgg1/dab_wallpaper_gif.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/xovajukoxin/business_english_lessons_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zubata/us_passport_online_application.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_off0000ea4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4F 4156 bytes
SHA-256: 5ae3bcc49c87f96444fbe3d11ff27db43b6aea299416b9f3d286273c64098da8
font_01_sfnt_off0000f87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87D 10224 bytes
SHA-256: 5166c0aed99571f91c47e22c59b2ddb86e86a6140eeb6b04ee25b6746c4be208

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