Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d3fd771ae40b008…

MALICIOUS

PDF

80.0 KB Created: 2021-09-24 00:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 466ea21c4674388bb4c455ca88f3cb64 SHA-1: 54e61064d178ed8f25933d860d46bde461581c46 SHA-256: 3d3fd771ae40b0088744eb1769c28f089bd953426e5b9746c11add84f9593826
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF's structure and embedded links point towards an attempt to redirect users to malicious websites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://smidgel.ru/uplcv?utm_term=android+developer+jobs+entry+level PDF link annotation
    • http://hoachattn.com/image/files/37511263739.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/wofumajolusisotaxes.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/58707726447.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353498677a7---sixajapemarozizige.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/nifiriwovanataxal.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/47707634442.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/23120950021.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/famatulovusinabupan.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/xolisubederajinija.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/pezadudomom.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/kijuraxilekizonuf.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fefimaxoxuvi.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/lomos.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/66800651763.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/57855517484.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109231547373852.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/vibofize.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/weviburuditumukaxirixina.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b74e3375f5---mowubasedop.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/zudewijilajuzifixivixo.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/gumokerukilazitonex.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210920053147.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/ruzekeki.pdfIn PDF document text
    • http://hangquangauto.com/files/gurolenofudiw.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://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_off0000d4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF1 17280 bytes
SHA-256: c26bf02a0f53cf3153d7aa9dc9c15c7fc7d92910260f1e518a9d56f2811e6320
font_02_sfnt_off00011a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A14 10652 bytes
SHA-256: d4248a7741c20bd715e9ff8b3591ace0323113701097ffe1b1cecb813edc08bc