Malicious PDF — malware analysis report

Static analysis result for SHA-256 27faf615c28f3a4e…

MALICIOUS

PDF

72.8 KB Created: 2021-09-25 22:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 16a11231d7c8f649f3c0873455d0c80c SHA-1: 7d5f81092a9ad5cc9718de9adb908079db71fe30 SHA-256: 27faf615c28f3a4eeddcd2d786f5bec53cd745320636e776332b9424e491a6fe
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate that the document's primary purpose is to redirect users to malicious websites.

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://synerhu.ru/uplcv?utm_term=best+android+camera+app+2019 PDF link annotation
    • https://nhuadailoan.vn/upload/userfiles/files/tikusafutolepi.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/rajovosibapiperuribavobi.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/16314603564.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/nifasaxumop.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/wulijutegolemokivak.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436bd5975fc---53601516104.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/lotoruneligogokawerulur.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/76862108656.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/zefam.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/29197645430.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/68800700905.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/59303481590.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/kakalabimagamokosotitu.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109240950528443.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/33025624327.pdfIn PDF document text
    • http://hadt.vn/upload/files/gipado.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/60519854771.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/65315347039.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/goduwuf.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/23419764082.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/vepikake.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/gotuzelogapagozowatawigod.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/78058065268.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_off0000b5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CA 11144 bytes
SHA-256: 31c83d54412c50581c0a707ab24d0c1663d0cbe907889b4fa51630a176bfecf1
font_01_sfnt_off0000cfe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F8 17808 bytes
SHA-256: 3853083d7f1959646fa92c3f6387b9b67c23de7d44b11db3ef7632dbdaf781d8

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