Malicious PDF — malware analysis report

Static analysis result for SHA-256 7838b613f8389cef…

MALICIOUS

PDF

83.0 KB Created: 2021-09-18 04:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 645985675237e27687494c2ca7956d88 SHA-1: 2b64412c367de330c99c6b396472391cc3fcdf55 SHA-256: 7838b613f8389cefc71a815dda9c21a19125420e8cb0619a03d054e4214a5946
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links pointing to potentially disposable hosting, suggesting a tactic to obscure the true malicious destination. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it is used to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://eqonetech.com/upload/userfiles/files/6295922805.pdf In PDF document text
    • http://lachambredechos.com/userfiles/file/74500729245.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c47519b82---tedefid.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4718d7daf---66403490688.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/64948750003.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/suleminavita.pdfIn PDF document text
    • http://amkchem.com/upload/files/lurut.pdfIn PDF document text
    • http://status.cz/UserFiles/File/96875151489.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/93924846063.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/37969512137.pdfIn PDF document text
    • https://halkapsikoloji.net/userfiles/file/21621755792.pdfIn PDF document text
    • http://15881588.com/ckupload/files/22237580148.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/96371205432.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/53363835675.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/dakigufaranoz.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/53369211868.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/19774473700.pdfIn PDF document text
    • http://lulanjina.net/upload/files/91972908646.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/35304969704.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/76599707651.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/tevigagazaluvelesifujuvi.pdfIn PDF document text
    • http://gewald.ru/content/Files/97525783505.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/juwidenadowuzowesu.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/fuwoweka.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/zewun.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/perovojavogururakif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=fs+18+download+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_off0000dea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA4 18396 bytes
SHA-256: 546bba966a4e31409aa350b5be548933a2ae80373a05a977acfb377ad3a6da84
font_01_sfnt_off00010ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA2 10380 bytes
SHA-256: 1acc5b444ca3ce2d9c8095b88b0f005d018c22e87834ef3931db37d9fe2878f2
font_02_sfnt_off0001264c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1