Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab9496cb42685200…

MALICIOUS

PDF

131.7 KB Created: 2021-09-08 15:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 08ed19db485270b4f50cb0b5c4853917 SHA-1: 0ae8d9ca5578e9fa15a52ceae9ef7d6c5d8c9b7c SHA-256: ab9496cb426852000e0604cfcff0b9ce4a616828ddb1ad213a656cd78cfc699e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting a phishing or credential harvesting campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the PDF as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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://crysiq.ru/uplcv?utm_term=wimbledon+open+2017+winners+list+pdf PDF link annotation
    • https://leuphuotcamap.com/uploads/image/files/10965815079.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/73929791638.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/nefelurijitixosutenobixik.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/831371007.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/28377043097.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/35913968787.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/rekemexakigikirepuvow.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/lagafikopokodirumum.pdfIn PDF document text
    • http://apismorava.eu/docs/56781854710.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/82010996344.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/mimumupurifaxora.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/pinojinagopigoforofedifus.pdfIn PDF document text
    • http://movediary.com/userfiles/file/34616553971.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f695b499c4---26750958744.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/24311393833.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/buvolimimerurukiwikija.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/061549029214.pdfIn PDF document text
    • https://seikai.jp/free_images/files/zirolovorugatofexipimebu.pdfIn PDF document text
    • http://centromp.it/userfiles/files/jatukidafogekujam.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/010abd81fdf7516616ad3e677378a56f/webizalifunosalep.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/24700238269.pdfIn PDF document text
    • http://iccarrentals.com/files/file/xetubidok.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/75825417026.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/79470932307.pdfIn PDF document text
    • http://remobudostol.pl/pliki/konokojizusekus.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/42371691641.pdfIn PDF document text
    • http://vtaky.sk/media/file/talofunuvopalexekikoni.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_off00019be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BE4 19348 bytes
SHA-256: 4db76412e283b9437823645b8563a410a79a790cab84406ec879b2e75b997002
font_01_sfnt_off0001cefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CEFC 11060 bytes
SHA-256: 7c202e536c9bfa35292e8e1373209cdf1cfa65e0b1257026b70a761d5ad45481
font_02_sfnt_off0001e8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E8A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1