Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17f5e772bfc9760…

MALICIOUS

PDF

77.7 KB Created: 2021-09-15 23:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0b80facd9b05be52aab7559ba9b5b5f2 SHA-1: b9e92e028ab3e9d5f4e3227a1ced785aac4f35ec SHA-256: c17f5e772bfc976030e62fac1c01fd4b06e06361ca6f75854322186855f8c8a9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external URIs, many of which point to suspicious domains and are likely used for phishing or to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • 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.
  • 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://xn--9w3b11kh5l.com/ckupload/files/66006991713.pdf In PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/juganetu.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/zulitin.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/29148666407.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/gabajobagopefibadi.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/digofutonunoziwagesujori.pdfIn PDF document text
    • http://vietnamairlinescorp.org/js/ckfinder/userfiles/files/75671632424.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///2171330090.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/boviniwenosategunitixil.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-6/20210906234221112997.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/82306491085.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/rijuviwe.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/74963845368.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/34380789742.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad1d48bfc1---80229713843.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/surezesipomivimubalidote.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/82877087234.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312ac15f5db---jejuwinuzisosise.pdfIn PDF document text
    • https://brod-plovdiv.com/images/21059691606.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/95371464182.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/72963167292.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/54061299268.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/fenupofenosi.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/gapozukobixelakerixadil.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/sobul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=phone+to+computer+mirroringPDF 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_off0000ce3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3C 10544 bytes
SHA-256: bb790725bad895de6fe45df5c03f40576ddd3cdb062871c844a567b80e2270e5
font_01_sfnt_off0000e606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE606 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE18 17096 bytes
SHA-256: b2d4b432795220d60da6857ba41dcfd62e8fe96e3c87b5af9195e0c054594d34