Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f348c1c834b99e…

MALICIOUS

PDF

70.1 KB Created: 2021-05-01 06:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8f8c3eae7465606c200fc4ab8b589186 SHA-1: de32482a79b6124f601a85408d3f67f0b52eb631 SHA-256: f2f348c1c834b99ef06daff89eec14bf4599e87dce639f127a991c49c2b85858
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. ClamAV detected it as a phishing trojan, and ML classification strongly supports maliciousness. The presence of embedded URLs suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://leonvi.ru/strik?utm_term=junie+b+jones+toothless+wonder+pdf+weebly PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370077/normal_5fe8bc50162c1.pdfIn PDF document text
    • http://marketitaly.pro/38225760030s5z8k.pdfIn PDF document text
    • http://hookup671.site/dexless_warrior_guide_maplestoryz36cx.pdfIn PDF document text
    • http://modebedunizux.iblogger.org/zepefanezumekobi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370767/normal_60248cecda3f7.pdfIn PDF document text
    • http://reduslim-shopufficiale.site/bugs_bunny_road_runner_movie_youtubevayz0.pdfIn PDF document text
    • https://rulorakaduf.weebly.com/uploads/1/3/4/4/134480735/99736.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380073/normal_600594b62ca4f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473642/normal_5feb20361427a.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/dowipasf9z.pdfIn PDF document text
    • http://tevubirufizibun.iblogger.org/xamumigujokibob.pdfIn PDF document text
    • https://lisiruzefixa.weebly.com/uploads/1/3/4/4/134495270/tiwexeli-rumuzo.pdfIn PDF document text
    • http://gododerur.66ghz.com/57336998858.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475588/normal_5fdde6e29c68c.pdfIn PDF document text
    • https://davugunibelerab.weebly.com/uploads/1/3/4/6/134612729/8557558.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zaxatuparogojix.epizy.com/nixon_time_teller_p_matte_black_surplus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6a67166-59a9-46c6-9c08-8e75955f9281/how_to_install_glacier_bay_bathroom_sink_faucet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9d3ef1d-8bb3-45a1-8785-f4cfea865ec0/mizoraregex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1632b9a8-2bc4-4343-b95c-ffaf7fefc754/54482087481.pdfIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_e302abd338ac4e448d1854fcb2a62298.pdf?index=trueIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_4766222a08fa45e5923c5df92adadeb1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/46ece1c1-cc67-481d-9d39-68cf4f55844a/is_pollo_loco_chicken_keto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c81bb1b-5491-49ff-bca6-f663cbba4169/zerajubapudusuvegu.pdfIn PDF document text
    • https://e7e1611e-f78d-4dfd-b5ce-3be5f579732f.filesusr.com/ugd/4b76a6_81a234c0c82c441da82e66e46cd785b0.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34E 5316 bytes
SHA-256: 956c4de6b37656792c267e1d74c3f6d50091b8dd3666ef72cf6917804fe95e56
font_01_sfnt_off0000e571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE571 10356 bytes
SHA-256: 93a66d2a2a21e19b587f41e9e6e558ddea9bd440fa499ff82633e3c3d719ed28