Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a2fddcc9ea7417…

MALICIOUS

PDF

77.9 KB Created: 2021-09-13 20:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c5083284bc21b5b7fde61aef184b4240 SHA-1: 5725e30c752854cb7709a1bf814e106a7dc2db8a SHA-256: 35a2fddcc9ea741741c4e1d7004221adf3a7fa86856fe744eabb2e0a9f3d34cc
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The PDF also includes numerous external URIs, many of which point to disposable domains and appear to be part of a link farm designed to obscure the ultimate destination, likely a payload download. The presence of embedded JavaScript and numerous suspicious links indicates an attempt to deliver a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mesimujewixarovaledodezer.pdf In PDF document text
    • https://mamap.in/ci/userfiles/files/49763651151.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021091009364646.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/67855501209.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/gemaxufaxomebu.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/kivaximizeta.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9941a40b3---902164919.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/zepivugirinegalap.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/mavexiberazivepu.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210911193448.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/52067108617.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/sizivifumemaxigumit.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/24714619813.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/dokewutejosaxevefajirokor.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/numunabumisudekiwudi.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/piginozefegigogukevem.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/didasitutevoxitebuvomamo.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/13853791201.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/lalifobuzunewifuwomijizeb.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210910042724381.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/82197829818.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090714581667.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/35699317354.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=zili+download+apkPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/20199482408.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_off0000cd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE584 17900 bytes
SHA-256: 2a96679fee538d3480fb9abbafc8d40852898fdcda4b57a57515643bb1c5df42
font_02_sfnt_off00011405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11405 10028 bytes
SHA-256: 69ab8aa0733d827297f52d502fb4341a1448e4442aebf33dff032cf9b5ca97cd