Malicious PDF — malware analysis report

Static analysis result for SHA-256 137ddc5408699e06…

MALICIOUS

PDF

82.5 KB Created: 2021-09-16 11:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 805ff221d057a0f8b58e4708ac8b685f SHA-1: e39342dd388f1cc80fc518b94339acadb28573db SHA-256: 137ddc5408699e06b81262aa5c4ef0dbb726cdb0e071ccbfa4aaaac357095064
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution campaign. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on potentially disposable domains. The embedded links suggest an attempt to trick users into visiting malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://www.asoriofrio.org/ckfinder/userfiles/files/furafepavomesareped.pdf In PDF document text
    • https://daqing-jewelry.com/uploads/files/202109060258041256.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/e6n3midlgbcagqo69klr1qcvsq/miwevizopixewafex.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/63558438163.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/vuwirete.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/fitewixezetetojopofope.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109031558122702.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/89921828284.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/jerujiniked.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///45341430931.pdfIn PDF document text
    • http://sakem.org/userfiles/files/wofevenuxe.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/taxilefetil.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/34556991718.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210915_EA03E08E8D3A9310.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/94041554055.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16135f6a6c4c5f---numiparelugasilibirewuder.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/79408269052.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/jokoli.pdfIn PDF document text
    • https://wasael.com/userfiles/file/jetekor.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/rojixa.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/gidetoxi.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/46dd4b99247b964aa9a2ae9b73831401/befowugakoboba.pdfIn PDF document text
    • https://sanmuabandoanhnghiep.org/images/content/files/91273652675.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/ditefawoledizapexim.pdfIn PDF document text
    • http://robbes.nl/media/files/kigagapigobafafor.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/61435874240.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/pevosedixoradojitu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=adobe+scan+mod+apkPDF 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_off0000dccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DE 18132 bytes
SHA-256: 6e5f1ed4f9ccf3663e993f0f9c6ffcb68ae41e989912c756cab040fab36964c4
font_02_sfnt_off00012465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12465 10552 bytes
SHA-256: a43cf703b0382851d5732e12d481f7eb703999db5b35cae127868fc3871936db