Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad408feeb0685e2…

MALICIOUS

PDF

70.3 KB Created: 2021-09-14 03:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d9aacb15fb283a7fdac55e0f16c7f230 SHA-1: c43962d8f467dfea2f2c44e5ccc308ecf677388b SHA-256: 4ad408feeb0685e2cd9fb67523530cc6b33f45134fa037388c5ac0a1097149f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs suggest an attempt to lead the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://haisanquangninh.org/data/dulieu/files/waniradabe.pdf In PDF document text
    • http://dui-antidote.com/images/userfiles/file/padevelofuwenapemejapitu.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/65267871470.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/83930623084.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/94493193144.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/59292691087.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/furilorofefurowi.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/48044156249.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/dosidevetiwogifugegex.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/zevomi.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/pubopunasugigi.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/77237549601.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/61681194532.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/tasidikorod.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/48174724910.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/vobozaso.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/20c7ee2f2fd464bc632239635efa7ef8/rijedo.pdfIn PDF document text
    • http://airmon.hu/images/files/65430737861.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210905163114.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/99266338835.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/dazifajuraduk.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/notuvipanikiseve.pdfIn PDF document text
    • http://4rrecycle.com/files/file/17197366757.pdfIn PDF document text
    • http://iknow.pl/files/file/mofexawojabojejov.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/6167690254.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=rich+dad+poor+dad+series+pdfPDF 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_off0000b547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB547 10516 bytes
SHA-256: 9f17af7e2b6c4534d5015670be278604751954464a54170c3c02075e025e0412
font_01_sfnt_off0000cd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE568 15148 bytes
SHA-256: 7e8e5e3e2c944ab31ddbbb5c94845760c5413be458fc16d813ae0c1b09a2825b