Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d2c0ee677ddfc3e…

MALICIOUS

PDF

70.8 KB Created: 2021-09-28 00:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 54bd46a592a43ee727b923022036347c SHA-1: 3d42bd4930cd6bfcb52e90b2783962dcd330b915 SHA-256: 4d2c0ee677ddfc3eef7e486b916aeb09c360fb7aa56c1cad2c3a0f1623f13620
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple external URIs are present, suggesting a phishing or malware distribution attempt. The PDF structure and embedded URLs point towards a spearphishing attachment vector, aiming to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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=qr+generator+free+with+logo PDF link annotation
    • https://www.dtd.com.pk/ckfinder/userfiles/files/gusefu.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/8714657030.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/loronegulemeramofogetox.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/86294410494.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/77336151715.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/52046692052.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/junudomesimofegukod.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/4211252105.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/vubowemumuguwijibimufezig.pdfIn PDF document text
    • https://bawauang.com/contents/files/21832021990.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/19617162961.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/vajugejexibazurobesidijip.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/jabosolirotewetuwora.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/32562961404.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/16359530292.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/jemasitizalejarobarema.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/5285341742.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/regudopasusotudoset.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/58985773042.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210925032734721.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/mevibufaxonugekoj.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/duxefufajibexemevipol.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/639f7f7f4e638668b7765470a77d8da6/84713380037.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_off0000b231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB231 16792 bytes
SHA-256: b4feebd64b004a3bda3d68a27ac3db76c7cf3baf138aa969ffb393bf3e24b3f5
font_01_sfnt_off0000dd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD97 10468 bytes
SHA-256: 393631b85879c9f2baef4f03e04632ef3c9138626ef2f10e07e2ba655de50f75
font_02_sfnt_off0000f569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF569 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1