Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a0a349ee13bb5a…

MALICIOUS

PDF

90.9 KB Created: 2021-09-24 03:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a65acebf7440f3ec7e01bab93e32a1db SHA-1: 4cf3d3eaecaad38408e5bc041c0f3e0a3f6cc3d2 SHA-256: f2a0a349ee13bb5a9cc49e2838dc17fdee2a879bb9878cfc28ea5c006d27a9a4
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm on disposable hosting. It contains numerous URLs, with one high-severity heuristic pointing to an algorithmically-generated URL, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://huuphongplastic.vn/uploads/images/files/wemebetamebowivolexo.pdf In PDF document text
    • https://kede.org/userfiles/file/78888436052.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161446428345f4---35223403853.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/tininivimebubo.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/66038977816.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/pafinebubajisuxil.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/3794138342.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/merib.pdfIn PDF document text
    • http://www.heksan.com.pl/file/jogerewudis.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/zojovuxevotali.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021091100174146.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/75603001529.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/57958586684.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/fejozoviniwu.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1630651893.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/jogito.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/nobonivewoxex.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/lusizidumiwikoxoguzufud.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/bezujejomenaw.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/kaxuv.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/temusederabanavenokimoteg.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/50940891746.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/743978e8c3850cdbb4a6f7f68da65fcd/debebetevorituvozisesub.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/lizefoziki.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/52848633948.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=buzzbreak+old+version+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC7 17520 bytes
SHA-256: 4fb9cce5286e5fc13873321ff29a4e0aa899a1e2525483f51959f7ed74a9e98a
font_01_sfnt_off0000fa3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3F 10800 bytes
SHA-256: 2ff5ed32603986a388ed813d2d0b113c96e50cc9d2b408a3f21aaa552d8bee23
font_02_sfnt_off00011312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11312 19032 bytes
SHA-256: 51a13d56a5156337c16be683379a7e8963a3bec1f086c48668b34e3eb2301d16
font_03_sfnt_off0001453e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1453E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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