Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7ca346eb5a32c48…

MALICIOUS

PDF

71.6 KB Created: 2021-09-30 23:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3640708fdc5dd7cd039975d94f6ff176 SHA-1: fbbda4fb36f0d631746e37e790b3f8c01d7160ca SHA-256: f7ca346eb5a32c48be57269312f809420a34bc9005cbff1d95916c23ed764fa3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely to redirect users to malicious sites. The embedded URLs, despite some being marked as benign, contribute to the overall pattern of directing users to external resources.

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 http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614f1279c96a5---wupaluxixaxik.pdf In PDF document text
    • http://tercovci.cz/files/file/51909150508.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/tokulimozokufaledoxad.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/kefunu.pdfIn PDF document text
    • https://adikkedua.com/contents/files/xikibuxuz.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210920_164733.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/88415157296.pdfIn PDF document text
    • https://people11people.gr/uploads/File/22690552624.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/56055024504.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/bapupip.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109230332543768.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/75114857873.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/sijarabi.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/duzogoxigoredujoxirep.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/59396864076.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/59983553955.pdfIn PDF document text
    • http://belstroyiz.ru/img/file/65676314944.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/26064533890.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/sulumutizaful.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/zaxakagu.pdfIn PDF document text
    • http://elma1.ru/!upload/files/65595468888.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/12289496812.pdfIn PDF document text
    • http://zeamailer.zeapost.com/FCKeditor/editor/filemanager/connectors/userfiles/file/35006624927.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+transfer+the+data+from+mobile+to+laptopPDF 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_off0000b326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB326 17160 bytes
SHA-256: 91a3e984853389577ae8d74856b4aad1377cbc7a62b29cb450cfb4b10cbdda8c
font_01_sfnt_off0000df1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1E 10980 bytes
SHA-256: ac2a2355bfd99ed617ddb23f820e298e62c3b246956d44c48736d39b33425d06
font_02_sfnt_off0000f827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF827 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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