Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e6f1fb44fafb3e7…

MALICIOUS

PDF

76.1 KB Created: 2021-09-23 22:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 45e730b40283799a05c63ab5bfc3d535 SHA-1: d1363139b5cd2d739a27dc968d044e1f8fd80278 SHA-256: 2e6f1fb44fafb3e7dba78ab01037f9c2ba2325c939c580da6ec5b0414be0a8a1
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=lean+on+me+123movies PDF link annotation
    • http://kino-cosmik.ru/sadm_files/54725019373.pdfIn PDF document text
    • http://househouse.it/userfiles/files/31563298851.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/mabekur.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/nedezopizej.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/161463e3815ec7---baget.pdfIn PDF document text
    • https://blogsma.com/files/74769090170.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/kupolotewa.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/dejuvofowuzapi.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/82025917061.pdfIn PDF document text
    • http://khacvietlaser.vn/public/images_news/files/33672199445.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/ruwupisitoworowulipew.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/98529503375.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/14329613416.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/95470351350.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/fefexasunobuvej.pdfIn PDF document text
    • http://inica.org/files/file///fawuwitibilolodikubuxager.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/59430206440.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/94645840650.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/josifatelezapa.pdfIn PDF document text
    • http://ijfbn.com/editor_up/59477501164.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/59387416944.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/bufejamagamejifugu.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/37712636051.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_off0000c0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C9 10392 bytes
SHA-256: 4f6a08b14c39d37ad16f959e23e124237986991f590114137c468834d9f8cac8
font_01_sfnt_off0000d866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD866 19396 bytes
SHA-256: 0fad238c61102c99205d175e5677b91101271c63c2b78f9b523d739e4b718c96
font_02_sfnt_off00010aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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