Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd3ebac27fcc901…

MALICIOUS

PDF

84.3 KB Created: 2021-02-28 19:45:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c33b01d67b82e997d5c623eb8ae0d6b3 SHA-1: bfee9a14e32fa66666375a30090afca4b6a449d9 SHA-256: fdd3ebac27fcc901c9e55dc9879c6d4ea9fc7940fd98be075a3faff78e2588be
184 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to URLs that are also listed as embedded URLs. The presence of numerous links on disposable hosting suggests a phishing or malware distribution attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=the+5th+wave+cast+cassie+sullivan In PDF document text
    • https://static.s123-cdn-static.com/uploads/4371005/normal_5fcc7ae53899a.pdfIn PDF document text
    • http://goossyy.online/browser_video_app_for_android_and_iphoneyyvr5.pdfIn PDF document text
    • http://nigma24invest.online/commercial_cool_portable_air_conditioner_7000_btu_partsfoo0w.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/giYWIih/gulikovebojegedevas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489598/normal_5fd62d3907062.pdfIn PDF document text
    • http://1cats.space/mubovitezunagopapufariljx2n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413111/normal_601795a531d12.pdfIn PDF document text
    • https://cdn.sqhk.co/barugogip/jfhdQXk/boo_monsters_inc_costume.pdfIn PDF document text
    • http://vumamanepu.sportsontheweb.net/zudokorez.pdfIn PDF document text
    • http://oneitshop.pro/what_is_development_biology_embryonick71rw.pdfIn PDF document text
    • https://cdn.sqhk.co/nupasoxure/hiYhgR4/download_magic_piano_tiles_3_mod_apk.pdfIn PDF document text
    • http://wemuwetafivaxe.sportsontheweb.net/99166266744.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fabedidatifi.onlinewebshop.net/is_the_seneca_niagara_casino_open_today.pdfIn PDF document text
    • http://zimopup.myartsonline.com/livros_de_ingles_em_para_baixar_gratis.pdfIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/amc_8_2020_scores.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_off0000fae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE3 4444 bytes
SHA-256: 6016802f23d75749d5277171e538a816fc180d3a0dbaf5a1cb13eea9f348e8fb
font_01_sfnt_off00010a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A89 5016 bytes
SHA-256: 1bd3192db8f45128327bf9f5dc37e79929916a5cbed8829ae5afecb0ab4eb524
font_02_sfnt_off00011bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB7 11608 bytes
SHA-256: 2ef7bd8875efe19fcd6da81c05595aa1f837bcca00bdb497f14fc3364b6550ad

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