Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3d2faf4dfdfb53…

MALICIOUS

PDF

81.2 KB Created: 2021-09-11 17:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2bb1779a258992f245d323f09db015fc SHA-1: 903af988a4ffe796ef0c1d99eab7b85031b5ed1e SHA-256: ad3d2faf4dfdfb53c7e070cfef0a29c1b83974493919b9200627e2862e04f4c9
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://fobas.cz/userfiles/file/rebegomezo.pdf In PDF document text
    • https://damiel.eu/userfiles/file/94717296184.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c0de80588---43127599632.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/42934916939.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/rexivepuzi.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/15514111000.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/bemanagegebom.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/44110202223.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/26416565358.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/jopepivekunepeloruxez.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/95045996032.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/92703089133.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/38348067133.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/porutexekugunemoket.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/luriwexujevamuru.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/3593611156.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/91784272160.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/17372145172.pdfIn PDF document text
    • http://domario.ru/userfiles/file/21938923525.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/92834088169.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/sapumofilemogovarite.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/69766193514.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/gudezunevuj.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/lizetikotadapasamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=wavelength+of+visible+light+uv+and+infraredPDF 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_off0000d88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09F 17588 bytes
SHA-256: 8ae77e3dfd389d8d99fd0290f2f3220b04b962b24eaedb176d05090098456aaa
font_02_sfnt_off00011e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E42 10932 bytes
SHA-256: 537a28adc31cad95b2535b97eec60c3e5f6678574e097ba4e1b69c9880475b6c

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