Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5567f5619fda10…

MALICIOUS

PDF

72.8 KB Created: 2021-09-18 12:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 78c12ed3ec5c1915306ec08f8bad727e SHA-1: 03a96271d2ba806842d4f7895478e2db94db7257 SHA-256: ae5567f5619fda10c4e5f2b297916b49a55076ad8357a3d1c1f7ef1b1cce6dd3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one that appears to be a link farm, suggesting it's designed to redirect users to potentially harmful content. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=evaluaci%C3%B3n+financiera+de+proyectos+10+casos+pr%C3%A1cticos+resueltos+en+excel+pdf PDF link annotation
    • http://nakloboucku.cz/uploaded/file/vonatigenul.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/10775522736.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/26438013407.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/29012177841.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/pizekiwuzewo.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/tatediwuworagikarur.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/62b757547e9872b3a4b21d936a915fa4/72627031517.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/lesebu.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/6600542713.pdfIn PDF document text
    • https://shunnasato.com/37522884534.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/67947346279.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/peramenivefidetidopo.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/56852145671.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/dijawujugikofataduvadozag.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/77836865625.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/1122133405.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/vuvatekewodopek.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/kutizenemo.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/talek.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/50381741171.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/zafasugomobowugesijuve.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/sosakimusikozutoxi.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/25213197747.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/51039328789.pdfIn PDF document text
    • 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_off0000b88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A0 15688 bytes
SHA-256: c433f3232a43b185019c8693d5e47961de304a9ff22775f11b08bc8654eb0ae9
font_02_sfnt_off0000f6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F6 11472 bytes
SHA-256: 210fbdbef45ecfd8fbae5dd508e44dbe6ee502ad69cdfe59876d4c8b0f1b8fc3