Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f6f086b6216969c…

MALICIOUS

PDF

96.5 KB Created: 2021-09-12 22:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e4fbcab47954511b8c1721b52cd2eb48 SHA-1: 83deb3b1f6316a36f2fb3e52d8cd656b81558422 SHA-256: 1f6f086b6216969c2651f2c80c724a4fb3b9e4e387df6831465fbda6eff01adf
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to suspicious domains and identified as part of a link farm. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution. The presence of a disposable link farm suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613d121244c7a---67269766349.pdf In PDF document text
    • https://laflammerouge.ch/userfiles/files/66784400554.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/lojim.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/51666489947.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/35817920f960af2590e796b7b1d10c1d/68356079656.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/71878673458.pdfIn PDF document text
    • http://linker-apps.com/files/fewulu.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/zopadepepud.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/sulegapi.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/pipuga.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/xexikenatazilexofaxaje.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/nupudolokunibuto.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/gegop.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/31376133054.pdfIn PDF document text
    • http://afro-safari.com/upload/files/3912090038.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/60088929214.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/41220106953.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/67199785020.pdfIn PDF document text
    • http://synowka.pl/galeria/file/dolewovifaliral.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/152065173261397946cf453.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/78650989978.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/tolevapuruwogisije.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/begatedovotoxowerawovavil.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/zidawirinalopibot.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/dofevom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=watch+harry+potter+and+the+chamber+of+secrets+full+movie+freePDF 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_off00011153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11153 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001296a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296A 11300 bytes
SHA-256: 0368bc7eafcf1b44b876638147f139717a9f2a71dac4bc3dc0c67862ee9791e4
font_02_sfnt_off00014399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14399 18656 bytes
SHA-256: 75d70eed9603caa3da27a39960ad14069f859a05541e59d692b6ffbfdd8abf56

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