Malicious PDF — malware analysis report

Static analysis result for SHA-256 946b73a768993f58…

MALICIOUS

PDF

76.9 KB Created: 2021-09-25 10:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0251f0e9f6e981869565258ff72cceb0 SHA-1: 38aa2b39f74e39084a03da592b63cdd4fd593fd7 SHA-256: 946b73a768993f580c6871a4eadc4e3701a4087d14ada45c811220feaf205cbf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting an effort to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an intent to exploit users through deceptive links, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://wastran.ru/uplcv?utm_term=como+descargar+pes+2012+para+android+desde+el+celular PDF link annotation
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161478744d00c5---4188307369.pdfIn PDF document text
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/66417070445.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/27773594927.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/miside.pdfIn PDF document text
    • http://regcureguide.com/files/files/10048889509.pdfIn PDF document text
    • https://breedlife.com/upload/files/40549933788.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210913011439.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/ropegitasodabexeru.pdfIn PDF document text
    • https://pcetravel.com/files/file/44458927789.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/xapapebeza.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/zidemexuviruzolakox.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/358455528.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/sesofafulelobinirap.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140c353a8d97---32599977280.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/66641117349.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/wugopiduluzisezolonezo.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/tafesobagoxumolupukunusip.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/rubazawujekunetose.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/lodiposularadivutafasuje.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/gekemufofexanuwibome.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/11578040001.pdfIn PDF document text
    • http://kidzcastleschool.com/singhania/downloads/file/fegezonewafokerevutafu.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/37934147200.pdfIn PDF document text
    • 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_off0000c0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C5 19432 bytes
SHA-256: bc944b464ea3b19568b30497c9a1c58ec74cc36587d475fc5d464c1c08edd213
font_02_sfnt_off00010b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B63 11184 bytes
SHA-256: 09673d0019b4f7ee02902aaa48d6a540a5323957772d94382929ba41366a63fb