Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9e09aadffc579a…

MALICIOUS

PDF

72.7 KB Created: 2021-09-11 18:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b754e5438a6819d7aac0df4d01ff5814 SHA-1: 681f21b3bef4161ee8514a96f36f0f86c2dc69fb SHA-256: 5c9e09aadffc579af2a76d1f83347f99d1b4cd6b5cd6c5b59123de7c0686d410
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or to redirect to malware download sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, reinforcing the phishing or distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=unni+vavavo+mp3+song+download PDF link annotation
    • https://oxfordjsr.com/userfiles/file/zubuteziz.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27431070571.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/sutadob.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161371b187bd41---32399334576.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/45115689597.pdfIn PDF document text
    • https://digireg.lu/upload/12639223033.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/wagidalovoviv.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/peritelunawoxi.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/lazejinisu.pdfIn PDF document text
    • http://anindecor.pl/files/file/97007497580.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/pifotajelepovibiju.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/fepopomurabekasizat.pdfIn PDF document text
    • https://digireg.at/upload/legupemosebavugi.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/telasonarenololeratatinat.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/tileliwawo.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-1/20210901134905550441.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/tosotir.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/mujoxif.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/lafejokavobilukafarim.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jusol.pdfIn PDF document text
    • http://miydz.com/mingyi/images/userfiles/file/wawobitijogumelez.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/8075977877.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/75413571762.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/numanexut.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_off0000b953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB953 16800 bytes
SHA-256: 057e8e4b59e3517846cdd9f2c61a814b8234cc74869b2a590bb91e33bdeaadb3
font_01_sfnt_off0000e46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC85 10736 bytes
SHA-256: 301f73c10dab6a007b9c50348756d8d8d07cdbb94668452918352607070e0a63