Malicious PDF — malware analysis report

Static analysis result for SHA-256 57ddfd9e4da97fe7…

MALICIOUS

PDF

92.7 KB Created: 2021-03-21 07:04:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 521790e7c381a3ec0c7f94f3e29d3f87 SHA-1: 996715f598f1ef639e34e36d9f50ccb55182b83e SHA-256: 57ddfd9e4da97fe7e1c018c91accc5aecd0ddb73b0b2117f02347a8ef6c475f9
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The presence of a 'download button' lure and password instructions for an archive suggests the document is designed to trick the user into downloading and decrypting a malicious payload. The embedded URLs point to various domains, some of which are associated with link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://resalured.ru/award?keyword=bebidas+deportivas+isotonicas+pdf
    • http://fuvisetitisenon.mypressonline.com/fatores_de_risco_cancer_de_pulmao.pdf
    • http://rejawulomov.mywebcommunity.org/palir.pdf
    • http://physcoo.com/tokyo_ghoul_unravel_downloadlxqtz.pdf
    • https://cdn-cms.f-static.net/uploads/4444852/normal_6012663e9ebe8.pdf
    • http://gupiduwexe.22web.org/harry_potter_and_the_half_blood_prince_draco_malfoy_crying.pdf
    • http://juvovagesubo.mywebcommunity.org/rameri.pdf
    • https://cdn-cms.f-static.net/uploads/4377905/normal_601cc13f44615.pdf
    • https://static.s123-cdn-static.com/uploads/4409258/normal_60084f2a9de4a.pdf
    • https://cdn-cms.f-static.net/uploads/4378641/normal_5fd95a67d2d31.pdf
    • http://rijigikesezaga.mypressonline.com/investing_in_shares_for_beginners_nz.pdf
    • http://nebatomefov.scienceontheweb.net/how_sinkholes_form_in_florida.pdf
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/atonement_ian_mcewan_filmpkymf.pdf
    • http://zalofamanaw.22web.org/samsung_un55h6350_weight.pdf
    • http://mybatut.store/fevojazilogeliwuvmtbqo.pdf
    • http://zokiwedilar.mypressonline.com/41732426054.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gurabagoderes.atwebpages.com/pejudubefepe.pdf
    • http://jatomije.rf.gd/66661917497.pdf
    • http://movasedumanepe.onlinewebshop.net/85417128340.pdf
    • http://rukosivujuxu.atwebpages.com/los_hermanos_karamazov_resumen_breve.pdf
    • https://uploads.strikinglycdn.com/files/fe1468c8-9a76-4942-a743-1cac21a04826/potek.pdf
    • https://uploads.strikinglycdn.com/files/047b929c-0591-4f2d-964b-8b9ee0e535a3/whirlpool_cabrio_dryer_wed7300xw0_squeaking.pdf
    • https://uploads.strikinglycdn.com/files/0c556b2f-85c7-4f81-885c-5a3f56ba77e3/bawokaxewidowe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012a0e.bin
de64bb4ce3fcbc05dcc50f24f0a837a656c6e89b4f51feeb05bce82072c69bd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0E 5364 bytes
font_01_sfnt_off00013c63.bin
3e66211d231422df7c2c81335c81eb5a5a8c504d166a5ac610201d3d2a5664d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C63 12216 bytes

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