Malicious PDF — malware analysis report

Static analysis result for SHA-256 34f10813ea21c565…

MALICIOUS

PDF

102.9 KB Created: 2021-09-09 01:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aef4c649ca04189704a20102233ed270 SHA-1: 8c462501285e0eed11fef994db34b180ac058444 SHA-256: 34f10813ea21c5655b837e5dfda8d17f7beda7878aa70e9bb9ab27f4a357b29c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, suggesting an attempt to obscure the true malicious destination. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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 http://chiesamadremarsala.eu/userfiles/files/ruzafeguneguvujeb.pdf In PDF document text
    • http://brmhn.com/userfiles/file/20210909055335_560vj8.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/vapufonex.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/guwedafutuniwimem.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/sirarosunexelorobeziv.pdfIn PDF document text
    • http://alcantara.cz/data/file/sopapagudag.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/29331401860.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/2011320309.pdfIn PDF document text
    • http://hevolta.com/upload/file/zapimunanazifimuziseniji.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/mivavuzixabu.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/85004719228.pdfIn PDF document text
    • https://palet-school.com/files/files/29230314762.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210901/file/folegixapemigajivaza.pdfIn PDF document text
    • http://clingac.es/d/files/1794905347.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/67fceb5a15f420c24d51b373cb438a7f/30180527937.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/24871678023.pdfIn PDF document text
    • https://cmoretv.com/userfiles/46966348588.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/vibakikoradomupeselup.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/mutifufalu.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/20172038326.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/94130924369.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/redovedilenidorezakiza.pdfIn PDF document text
    • https://geelaboba.dswip.com/ci/userfiles/files/wosemorusube.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/51869613036.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613933d5079a2---lofed.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/lexefejamufokurabubuzoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=wish+you+were+here+1987PDF 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_off00012d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14537 18976 bytes
SHA-256: 22a8e61a4c9cdc7a38ea33a5dc29fc19a73bb312ee2856eb18deca86a9861dbc
font_02_sfnt_off00017602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17602 10568 bytes
SHA-256: 9207d459317c333b8512bf140b750b84dc876cc4f3b6b76858756be7fd28c4d5