Malicious PDF — malware analysis report

Static analysis result for SHA-256 3652703bc119b14c…

MALICIOUS

PDF

76.9 KB Created: 2021-03-01 12:37:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 32bb001ce3cb1c6237d904d3338e1bf9 SHA-1: da174ea3642688a850f98d45a323932bcbef2f5e SHA-256: 3652703bc119b14c7c7e83e9b282d61425c8a0d99bcf937577e143369bdb15a5
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites for further exploitation or credential harvesting.

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://vilenefex.ru/award?keyword=how+old+do+you+have+to+be+to+work+at+kung+fu+tea PDF link annotation
    • https://cdn.sqhk.co/lixejudazeza/higoBhd/television_show_quiz_questions.pdfIn PDF document text
    • https://cdn.sqhk.co/netimawifes/eYifdBD/monster_truck_movie_free_download_in_tamil.pdfIn PDF document text
    • http://linudanozuno.iblogger.org/kindergarten_2_outfit_guide.pdfIn PDF document text
    • http://bobixuposu.22web.org/barbie_girl_english_song_320kbps.pdfIn PDF document text
    • https://cdn.sqhk.co/goganededem/whfidgw/fozuwoj.pdfIn PDF document text
    • http://lnstagramaccounts.com/dead_trigger_movie_trailerhtm8n.pdfIn PDF document text
    • http://maslovauto.ru/443039797095e2f3.pdfIn PDF document text
    • http://bimufufedo.22web.org/8080600724.pdfIn PDF document text
    • http://runmasten.online/46977102536mjs2b.pdfIn PDF document text
    • http://alexsaf.ru/gepomolejb1j5.pdfIn PDF document text
    • http://legendnat.space/pro_mod_racing_2020cgr2r.pdfIn PDF document text
    • https://sejevijuwev.weebly.com/uploads/1/3/2/7/132712154/vajoguxagaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fefasowuri.rf.gd/hp_officejet_pro_8610_paper_feed_problem.pdfIn PDF document text
    • http://masuroti.rf.gd/seussical_the_musical_script.pdfIn PDF document text
    • http://fikupamipevow.rf.gd/xepelaresibajifujanisa.pdfIn PDF document text
    • http://robajev.rf.gd/33678237739.pdfIn PDF document text
    • http://nedepufeto.epizy.com/goxel.pdfIn PDF document text
    • http://wumikexenuge.epizy.com/73361368533.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29A 5244 bytes
SHA-256: b0e6b21843d251c6d007589089d489e74452de37bb827594a1625437e0d04dcb
font_01_sfnt_off0000f48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48B 10468 bytes
SHA-256: 9cd4840fb8ce0ceac2965dd6984191dfd186e4c7fbecd2f5ca290ec7833bd37c
font_02_sfnt_off00011825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11825 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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