Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe55fdcab222fad…

MALICIOUS

PDF

68.3 KB Created: 2021-09-10 19:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1193506f342a9342d8423028db711a02 SHA-1: 913f840cd1eab688099801ba296dc3eb5f3963c9 SHA-256: 5fe55fdcab222fad5df3af3112d6249df74af3c445aac73f86fd5a06579342c2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a phishing lure, including an image-only interface and embedded links designed to trick users into visiting malicious sites. The presence of embedded JavaScript and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate malicious intent. The document likely serves as a delivery mechanism for further malicious content hosted on the numerous extracted URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://dogomanhnghia.com/uploads/files/99689665162.pdf In PDF document text
    • http://ghalemdi.com/userfiles/file/77372824809.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/fugoteruj.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/wupojixatinaw.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/84846899939.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210908123604.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/redoboxerapuvowitaka.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/lodavewukakoxoxesamonoku.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/gibivoxevibidiruxedoxeb.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/gakawadisobixuzowekow.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/tasuduwumalotutifemi.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/47067394345.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/talunulivojukasuwopuzeg.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/ratepukusabipadetude.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/lidanozolupevu.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/jobonawolabeju.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/tujurovazataboditefajel.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/3192638286.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/39199172119.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/49659913866.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/timatemimedewowunuz.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/wabolelifek.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/10161526314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=itunes+music+on+androidPDF 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_off0000b079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB079 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC890 10536 bytes
SHA-256: c8b7e1c7fac9344d23e625e6fa094b5fcb8b17087ae3fdf2a0d3c44249d1e8d2
font_02_sfnt_off0000e08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08A 14248 bytes
SHA-256: 9a5cff207e0f77e29da96d5b4b8d3ed2ddf5ddc2efc0c5bd4a75e087e6a3888e