Malicious PDF — malware analysis report

Static analysis result for SHA-256 73034fdd4e1f2045…

MALICIOUS

PDF

82.1 KB Created: 2021-09-13 01:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 2e8c5704c2a7c63dd49a965d696af0bb SHA-1: eb657ba085d3719d1a94460d3e32af837e004c35 SHA-256: 73034fdd4e1f2045ff8e74482c5a7ae19928fbe6c4f5e0a5e87f3b1f0fe5c76e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs and a visual download button, indicating a likely attempt to trick the user into downloading a secondary payload. The presence of external URIs and a link farm heuristic further supports a malicious distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=wwe+mayhem+unlimited+gold PDF link annotation
    • https://techson-cctv.com/upload/file/23981865010.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/pupuziwusi.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/pejugefuxigeninonini.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/6268755793.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea3f3abd5b---vegobixezifegotebilemiloz.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109111901096058.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/49717907379.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8f7a72598dc9f786a1af1cdda67f0b5e/wetewiz.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/sepadexesudavakazupota.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/tedetige.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/45578198367.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/14920639213.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/sokaxonobob.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/tumib.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/42536702694.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/56297269175.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/likafexowezumavomak.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/xevozuvejosivesejajosi.pdfIn PDF document text
    • http://serting.eu/userfiles/files/8042519359.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/28636950053.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/muvenakozisofagu.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/luzif.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/tovavalogunaroneroxil.pdfIn PDF document text
    • http://greenglobepms.com/uploads/bagumebulomamenu.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/7111860960.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_off0000db1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF330 18196 bytes
SHA-256: ae8d11f49b3574d94e8faac1ba72a05c41eaeb571f44d94c692fd9f38eb03e6f
font_02_sfnt_off000122d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D0 10720 bytes
SHA-256: 754a9783b00f601bc3645fe48e77e7300734f064c9e5e5d8bff86167add8ba99