Malicious PDF — malware analysis report

Static analysis result for SHA-256 e175a139aad98e7a…

MALICIOUS

PDF

74.1 KB Created: 2021-02-08 09:42:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: b59d64ce6299c3bafd68b84ef22342e1 SHA-1: dfbdde8fd51c85704c249c18283d0169172d0b38 SHA-256: e175a139aad98e7ab1b85a688596276f5d963a494e30272d272ed29f64b701a5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or delivering a trojan. The document body, though heavily obfuscated, contains references to 'nds emulator paid apk' and 'wkhtmltopdf', suggesting a lure for software downloads.

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/aws?utm_term=nds+emulator+paid+apk PDF link annotation
    • http://kekebum.22web.org/46037541501.pdfIn PDF document text
    • https://nadatipaj.weebly.com/uploads/1/3/5/3/135347779/sowuze_rumibudexajowak.pdfIn PDF document text
    • http://homebig.space/moto_z_play_front_camera_not_workingr8fj3.pdfIn PDF document text
    • http://numberoone.xyz/331317003777hqg0.pdfIn PDF document text
    • https://nevutero.weebly.com/uploads/1/3/4/7/134716167/dapasemimaxewesinas.pdfIn PDF document text
    • https://davixugamewa.weebly.com/uploads/1/3/5/3/135334906/6431580.pdfIn PDF document text
    • http://usersonlineguardingsettings.site/como_hacer_un_alambique_casero_para_destilar_alcoholjsskw.pdfIn PDF document text
    • http://cmb-accueil.com/language_a_reader_for_writers4t0xy.pdfIn PDF document text
    • http://qwertyujg.xyz/604105859557r615.pdfIn PDF document text
    • http://clobuss.ru/sopewesofadokurw0iyc.pdfIn PDF document text
    • https://cdn.sqhk.co/xufojidaju/jhJjfjb/7894810102.pdfIn PDF document text
    • http://zenarajare.22web.org/best_cheapest_android_phone_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/gixejefi/eNgdIha/extreme_landings_pro_free_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xamipekuxedatif.rf.gd/duripajovogisale.pdfIn PDF document text
    • http://fedatowuka.epizy.com/75659942768.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_off0000e4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F5 5140 bytes
SHA-256: 9b99793ac07c669e1d3fe4ab312505d2f15d103f3a1b0db7fefe6c7b8d213d54
font_01_sfnt_off0000f654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF654 10812 bytes
SHA-256: 9e4d00405cc80c9d90697ac0b080a7e13850de5ef296ecd7a4e7bddf26681daa

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