Malicious PDF — malware analysis report

Static analysis result for SHA-256 dad271a233c63b46…

MALICIOUS

PDF

73.5 KB Created: 2021-02-17 21:24:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 36524aca294550f7db14960b0c47c4f2 SHA-1: ac247826bead84967963cf81e8103b7d11190539 SHA-256: dad271a233c63b46688ec1fd8260474c3fe503fd5a828e19a57a9ba554af8234
244 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, many of which point to disposable domains and redirectors, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/wix?keyword=the+big+nerd+ranch+guide+swift In PDF document text
    • http://winoorama.website/denulerubimepogipoponebinysvto.pdfIn PDF document text
    • https://petodudugagakot.weebly.com/uploads/1/3/4/6/134640630/6355948.pdfIn PDF document text
    • https://cdn.sqhk.co/zanuvajebodu/dmjhrEU/blood_red_sunset_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/bhidBHQ/bumupepudiwujasivixepob.pdfIn PDF document text
    • https://govotewimodiku.weebly.com/uploads/1/3/4/6/134649218/suduzo.pdfIn PDF document text
    • https://wokopapun.weebly.com/uploads/1/3/5/3/135388848/3716885.pdfIn PDF document text
    • https://cdn.sqhk.co/noxisoture/0ibgjjc/fruit_shooter_game.pdfIn PDF document text
    • https://cdn.sqhk.co/bevoletef/Yjeje1D/87172958723.pdfIn PDF document text
    • http://cheapkeys.site/87217759134uemvk.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/7zdIhjo/receita_de_glace_cozido_para_confeitar_bolo.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/iRfmifo/do_crows_eat_mice_and_rats.pdfIn PDF document text
    • http://graatorama.space/jethro_tull_bouree_flute_sheet_music_freeej53m.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/ijJofgo/10010172101.pdfIn PDF document text
    • https://cdn.sqhk.co/fusureviweki/jh6jck4/60965545956.pdfIn PDF document text
    • http://obuv-kozha.ru/812614330785ewrs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://misosemarimo.rf.gd/suxawusutojasoz.pdfIn PDF document text
    • http://kogogugo.rf.gd/types_of_steel-_alloys.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_off0000e091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE091 5432 bytes
SHA-256: da820778c253553e958102988cf4591792afeeafd554898c88476faafd75303f
font_01_sfnt_off0000f314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF314 10492 bytes
SHA-256: 29ee5efe02fe5eaddd1959b6f46c7c168fdf33eb14abc41af8ddf821c66a8967

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