Malicious PDF — malware analysis report

Static analysis result for SHA-256 ded2f56b20b5ebdf…

MALICIOUS

PDF

89.2 KB Created: 2021-09-13 00:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: df2f0d7288cc973dfd1d17a8ee3fe58f SHA-1: e7c593bf8b511379588d95772736a76dce4ea99e SHA-256: ded2f56b20b5ebdf6b41dc3ac9d5898abd3cad9a0670edcbf1b06e4bf2d5f362
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to potentially malicious content. The primary attack pattern involves leveraging the PDF to redirect users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://mnarch.it/userfiles/files/kuxuweroki.pdf In PDF document text
    • http://parikshitconstruction.com/uploads/duvatasiviwaxudemen.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/xelepaxutifubi.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/88799079677.pdfIn PDF document text
    • http://briztravel.com/upload/files/kukiluzetigunesa.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090417201693.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/getumovokebipif.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/93065519884.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/30395043018.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/nizewodidufunituweraf.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/89739901735.pdfIn PDF document text
    • https://ebus.myskoolapp.com/FCKeditor/FCKimgUpload/file/falumedutovapetowedomi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b3e0a6384---jakozozenafid.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021922114262217.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/55148881378.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///11211359397.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/5146283909.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1631439981.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/sidopumufonelafunap.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/pinoxogitiretuxowuzuxa.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/wusidobarezigekurose.pdfIn PDF document text
    • https://hsse.cl/files/lujarifugifimipo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=baca+novel+pride+and+prejudicePDF 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_off0000f781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF781 19004 bytes
SHA-256: 7f250578ffd2541dc226c5922ab92706fef563fe9af08f46420229dcf401ea65
font_01_sfnt_off0001270f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F26 10592 bytes
SHA-256: 67b8e6a11fc86711c83bb9dfc91d15cf3394f889f45cc5caf7d3085950d8ed16

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