Malicious PDF — malware analysis report

Static analysis result for SHA-256 b42073c61ba94bf6…

MALICIOUS

PDF

79.6 KB Created: 2021-09-11 00:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fea9e41a7b9a9f199a69dc60914737c7 SHA-1: cfac8b29e19b0d60a353452aad19def9ffb4a00d SHA-256: b42073c61ba94bf6e188840653de4b647cc465a235137c941582e20c676f9f85
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The PDF contains numerous external links, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were extracted, the structure and numerous unknown URLs suggest an attempt to redirect users to malicious or SEO-manipulated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://focalthai.com/file_media/file_image/file/wuwavizebobi.pdf In PDF document text
    • https://egokituz.eus/files/galeria/files/13781715542.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/wedusizizijel.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/suwexa.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/zizemumuxi.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/16600288057.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/22477964782.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/78328164623.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/sabewet.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139f735295db---67685028068.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/fusapanogavifigeborafajor.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/panomadejesipoforegut.pdfIn PDF document text
    • http://happy-playground.gr/uploads/_uploads/files/zanidupitizodovozoreten.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/58656156383.pdfIn PDF document text
    • https://mollis.rs/files/ruzovasale.pdfIn PDF document text
    • http://markone-tools.com/upload/files/tixevi.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/25126737035.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/tajaser.pdfIn PDF document text
    • https://service-panev.com/userfiles/98625489433.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/69756225750.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/92935114274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=amazfit+gtr+app+androidPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD246 10536 bytes
SHA-256: 1911e7aa0b4abb083026de8b34463fc5a437639a08239de49e2e13841086fc4f
font_01_sfnt_off0000ea0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10221 18164 bytes
SHA-256: 1f8d5c6bcd11781d77694e3d12180237b118c569254f3573efcd0afe932d140d

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