Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f56858314a7d4e4…

MALICIOUS

PDF

75.1 KB Created: 2021-09-18 15:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d4c0a64722e16b4945b69fd506a71bde SHA-1: 358f3a49f9259383633bc3b9afe39c99bd18d68f SHA-256: 1f56858314a7d4e4e08293edda2c09e4ba48cadfc1266529b442bc318752338e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which are hosted on disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack by presenting numerous deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pixomot.ru/uplcv?utm_term=big+head+basketball+championship PDF link annotation
    • https://pracowniatechart.pl/fckpliki/file/gogunexifinonalavitemod.pdfIn PDF document text
    • http://vucert.vn/uploads/files/3805669001.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/30044965174.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/tarolanixevelufido.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131d740e0305---56814827740.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/14865328754.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/feruranegirizarus.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/kobiwivat.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/56795409630.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/gotab.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/46292004531.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/76544141959.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/74834844944.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/gowojigomefalemiwibirozer.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/finofa.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/tetimerupidon.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/74130506034.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/sajebogumebab.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/39228849280.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/gatiwojinu.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/tidutekufuwi.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/xefevusisares.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/77959214131.pdfIn PDF document text
    • http://hzosm.com/images/upload/File/68817203949.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e0197670a---vutin.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_off0000c256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC256 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6D 11144 bytes
SHA-256: a942dcb7ab986fcc6ee53f3ab1a9946a65ec738b706449d36af8cb0fb9ca9ee5
font_02_sfnt_off0000f3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E4 16492 bytes
SHA-256: fc4b805f784beb3ab2279f0e88f0f68cec40a8e8e8a4c1f8be404d657fbd533f