Malicious PDF — malware analysis report

Static analysis result for SHA-256 c296f6eea7f3d331…

MALICIOUS

PDF

70.9 KB Created: 2021-09-25 13:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 471ecacf19d2311cb8147d0077bb03f7 SHA-1: 764563ff1d4b71869248c42a6a361c2a6bc47795 SHA-256: c296f6eea7f3d3316b3437cc2df4e4255ef289cd58f096a03a67d41259df39f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Numerous external URIs were embedded within the PDF, with many pointing to disposable hosting and using UTM parameters, indicating a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to deliver a malicious payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=find+the+missing+term+that+completes+the+square+calculator PDF link annotation
    • https://cowichanmusicfestival.com/userfiles/file/muzofirezikuw.pdfIn PDF document text
    • http://watch62.ru/files/files/kusixazofoxe.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sobozaginaxanir.pdfIn PDF document text
    • https://hssanesteban.cl/files/17798034254.pdfIn PDF document text
    • https://argumentua.com/i/file/rezezapopovajoxidu.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/dilat.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/wasatovava.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/61674368631.pdfIn PDF document text
    • https://debden.org/userfiles/file/In PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/64455888524.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/fovigexisizimuvadezi.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1614463a67386e---6216783939.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/57182908924.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e3d1b4055---kaxaz.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/13005873901.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/73607292366.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/ranekoxezezifor.pdfIn PDF document text
    • http://sartor.ru/upload/files/85553881813.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/76244510685.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/52918448358.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/navozenajunagupinogusolu.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/27923502780.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/a573e4fc0ff4c2e4a68c3396813fbdc4/pimizito.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/zufefazinuxolej.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_off0000b1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E1 15864 bytes
SHA-256: 673cccbd5df272fedbf6163b89a0e0587c84156ebb7b6146317a156350a6941e
font_01_sfnt_off0000d9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CA 11184 bytes
SHA-256: 8a18702c2da126c0e9cf3247c2171e5bc2e81ca0b753b3f391c9018f1efa2364
font_02_sfnt_off0000f331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF331 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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