Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a937e17efc942ab…

MALICIOUS

PDF

77.0 KB Created: 2021-03-27 15:28:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d6656db5d6a4b6727bce70f02db0881f SHA-1: b5f5fce6f6b2483e14d2f7b6a5dac0bcb8cbeffc SHA-256: 4a937e17efc942ab0e15383353c7e6c741c6ebc1e36049c218a6ea3a815f878c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including a link farm on disposable hosting, suggests an attempt to redirect users to potentially harmful sites. The document body, though heavily obfuscated, contains references to 'ehi opener apk' and application metadata, which may be part of a lure.

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://seumenha.ru/wix?keyword=ehi+opener+apk PDF link annotation
    • http://kismykeitio.best/zasifamixikuww832z.pdfIn PDF document text
    • http://pojibuvuj.mygamesonline.org/33118973169.pdfIn PDF document text
    • http://bipiraxas.iblogger.org/portal_de_formacin_profesional_andaluza_secretaria_virtual.pdfIn PDF document text
    • http://italysummer.fun/11321125979jlap1.pdfIn PDF document text
    • http://sosogemizibu.mypressonline.com/53584506341.pdfIn PDF document text
    • http://nasporte1.fun/xuzidoliwogadutomefc2bv.pdfIn PDF document text
    • http://tiktoktop.design/mario_kart_8_user_guide_switch0t1qr.pdfIn PDF document text
    • http://websporizle4.com/miseluvutap3oiz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451350/normal_5ff3aa3012874.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413851/normal_5fe00fc03ae94.pdfIn PDF document text
    • http://zexejodubaxiku.mygamesonline.org/barabasi_network_science_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jorunodup.rf.gd/bovovejiriwotavidulevuv.pdfIn PDF document text
    • http://lulevewutowa.epizy.com/10945586634.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c130af5-f128-4339-bba8-d1be6c792506/what_is_technical_writing_apex.pdfIn PDF document text
    • http://fakolelapokaki.epizy.com/kitchenaid_mini_mixer_matte_white.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a12b3c2-4ba1-456c-9cbb-7b14d9a178ed/xofuserawinipox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c49518a-bf99-4d27-be42-14200121a223/zageb.pdfIn PDF document text
    • http://bepenopivite.epizy.com/jabadakijanowanifugujir.pdfIn PDF document text
    • http://nalirabagetovop.epizy.com/que_es_un_enlace_ionico_y_covalente.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF131 4716 bytes
SHA-256: b237045a002bd90f2b502e1219eaf1a4ee5691e582db6c357d194846646b2e61
font_01_sfnt_off00010134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10134 10680 bytes
SHA-256: ca2bea1b66904f274ca3c78370b85eeebe8f0d4b3ac608744aac0482fe372555

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