Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d4d575b097b2a48…

MALICIOUS

PDF

75.8 KB Created: 2021-10-11 19:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: dc45d559bda6b569ade3fcc80cf80358 SHA-1: 9650f1d9d32f4bf1501ca235067c22a5cfbb1c7e SHA-256: 2d4d575b097b2a48679dfeae31c3b474626f243ab7138b6c9331f2029ea6b2e4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The PDF contains a large number of links pointing to various domains, many of which appear to be disposable, suggesting a phishing or link-farming operation. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs are indicative of malicious activity, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/redoruxiliduf.pdf In PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-25/20210925180232951886.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/wavas.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/ravatefegazab.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/92584062378.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/seregofotojabegijake.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/89256687766.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/43243412088.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/69039858798.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/17469859645.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/805969649.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210907205358.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/10240842512.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143351788857---82333998696.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/74984812302.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/vodisasuwi.pdfIn PDF document text
    • https://magnumattachments.com/ckfinder/userfiles/Files/10881613825.pdfIn PDF document text
    • https://clickbox.ro/images/file/25665209039.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/s2tma98lsbpa5ictalgfl86n6v/pisikovatuful.pdfIn PDF document text
    • http://thietkevang.com/upload/files/32000678057.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/48173981098.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20211009215158.pdfIn PDF document text
    • http://xn--80aer5aza.xn--80aai5amepo3c7b7a.xn--p1ai/ckfinder/userfiles/files/jidadifesugoserufoseg.pdfIn PDF document text
    • https://kokomanis.com/contents/files/simenozaw.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/57929244834.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/xenadewug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/D9plVHj2VOU/uplcv?utm_term=pictionary+online+multiplayerPDF 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_off0000c484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC484 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9B 10584 bytes
SHA-256: a1d1740436d8ebef4ac18585f3eb1303e1abee3cfb555266e2583e6da5212975
font_02_sfnt_off0000f4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CC 17144 bytes
SHA-256: cc5750c05e8de53f5ca750909d158dc809c6732bde18cc974706983010de7b96