Malicious PDF — malware analysis report

Static analysis result for SHA-256 459c5111481d653a…

MALICIOUS

PDF

73.4 KB Created: 2021-01-18 17:16:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: f91ec3f6ea3c16b693eeb3b4b9cf1dfe SHA-1: 7d1e65bd57e530a51036bd2d80f76cc30fad7d6c SHA-256: 459c5111481d653acaa5a4808e3291aceedf99bc5061492bee337439ba985309
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'Captain America civil war wallpaper', aiming to trick users into visiting malicious sites.

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/aws?utm_term=captain+america+civil+war+wallpaper+hd+android In PDF document text
    • https://cdn.sqhk.co/lojavowi/Mzniagj/74400237581.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414687/normal_6003f6c896c77.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/iezhdjf/vuwozaxebatokujedanatajav.pdfIn PDF document text
    • https://site-1178634.mozfiles.com/files/1178634/wagogosaxifajadanuxurera.pdfIn PDF document text
    • https://cdn.sqhk.co/pomoliwekag/UkdjbTZ/82788719808.pdfIn PDF document text
    • https://cdn.sqhk.co/pitadewedobu/GmbgdnF/second_hand_children_s_clothes_online_uk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425211/normal_5ff31d6c52cf1.pdfIn PDF document text
    • https://site-1175198.mozfiles.com/files/1175198/download_mgamer_win_free_diamonds.pdfIn PDF document text
    • https://cdn.sqhk.co/nenexozoz/ib6RgdS/andy_king_soccer_player.pdfIn PDF document text
    • http://dutuxagedam.66ghz.com/mowukugugik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luwulifinuneti.epizy.com/batho_bana_ke_bao.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/41565391833.pdfIn PDF document text
    • http://nolumuj.epizy.com/manualidades_con_reciclaje_para_vender.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/certificate_of_residence.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/nijatolonatebemuwo.pdfIn PDF document text
    • http://jeragapa.epizy.com/29967034155.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/37592971201.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/36816555021.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_off0000e24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24A 5192 bytes
SHA-256: 02e7639fcd460f9ebbaaaa3b935f4e69cf553f224de9466e973b456c4e87c78b
font_01_sfnt_off0000f3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D6 10584 bytes
SHA-256: 4fa223f0cc9978464064796f405c042be8c3a1046cbc8673f4a669c6bb95e1f2

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