Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3021a3ba07e5ace…

MALICIOUS

PDF

83.1 KB Created: 2021-09-17 06:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4364cf02779bc14282331759b2479f7e SHA-1: 21063269d93ad3e9159f9a5a4524b10d4d04da9d SHA-256: a3021a3ba07e5aced3f598fc27d63dc3847b5e23c7b085c654e9779272f6179f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by a machine learning classifier with high confidence and detected by ClamAV as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection mechanism. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://fontan-montag.ru/img/upload/7274102724.pdf In PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/83735361843.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/28778832244.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614161ded1092---xawizebisuxurus.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/vitofuvaruzizak.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/pokololofupuluzeka.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/18102884877.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/kexutasizonegezezej.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210910_5614DD83356B6478.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/kudigikunigiwubonizomemuz.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/winukumafi.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8319809fd---pabimeguxerujibar.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/fojomipobarakik.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/59981646559.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/40831599816.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/rakofu.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/vuzegalutemojurunemu.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/pugeletari.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/gegemaremafubifefafaloxi.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/gaxevojidalatoma.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/35067052686.pdfIn PDF document text
    • http://kurtoglumob.com/upload/file/rotamafasokizodulibapotur.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/nepilorakomavusuzewuzusu.pdfIn PDF document text
    • http://gotween.com/userfiles/file///fanivitopit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=pokemon+omega+ruby+zip+file+downloadPDF link annotation
    • 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_off0000ddcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E3 11168 bytes
SHA-256: b23b56876e042027ce18613c4ade1e09e1d17e2e9fa998a2519f8cd571749cc6
font_02_sfnt_off00010f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9F 18124 bytes
SHA-256: c410ea14bf0ee9e557343840138046dcbfa36019003412f35b0239de2998f120