Malicious PDF — malware analysis report

Static analysis result for SHA-256 b720849e588a373d…

MALICIOUS

PDF

77.4 KB Created: 2021-05-10 05:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 24c0ffa4c1c04a08ea26ecfaf011ee5a SHA-1: 6f6abb1cea7e325406c156365709cf3d40c304fa SHA-256: b720849e588a373d6f5eb2ab359073daa7701e00f8b6ee4072face6ef93dad79
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant number pointing to disposable domains, indicating a link farm or phishing infrastructure. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing lure, likely leading to a second-stage download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soxebez.ru/strik?utm_term=myers+briggs+personality+test+free PDF link annotation
    • http://fevavoke.iblogger.org/liduselerigol.pdfIn PDF document text
    • http://sozerujodurepef.22web.org/will_a_levels_happen_in_2021_uk.pdfIn PDF document text
    • http://josebixotarez.22web.org/why_learning_theory_is_important.pdfIn PDF document text
    • http://gedobitubojufu.iblogger.org/cardiology_an_illustrated_textbook_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/89da10bd-f43c-4fd4-b6bb-4ef99fa0aba5/7696966478.pdfIn PDF document text
    • http://xotewewo.rf.gd/zedge_ringtones_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1b7b715-4e0c-4533-8b19-3a41402cca7d/how_much_is_120_minutes.pdfIn PDF document text
    • http://nebopepebog.rf.gd/gadef.pdfIn PDF document text
    • http://terefikug.epizy.com/oru_kalluriyin_kathai_tamil_songs.pdfIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_4e93b6683cfa45429635fb426c449954.pdf?index=trueIn PDF document text
    • https://694dae7a-2033-4a59-8b06-91ff4eec0774.filesusr.com/ugd/e1d58f_0c74ee9b296f46a2aded88692e31383d.pdf?index=trueIn PDF document text
    • http://sikofus.epizy.com/adobe_audition_2018_free.pdfIn PDF document text
    • http://ferovugosewago.epizy.com/23517163856.pdfIn PDF document text
    • https://df1d5e35-4e67-4e57-ba41-6141a32c4ecb.filesusr.com/ugd/c54278_475672a43bbc4bec959eca2fcabc71ec.pdf?index=trueIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_73085121c73b4adfa9cb190b9602861a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/26f7d1ff-5c5d-4b5c-a8f7-9a50d04c58ec/88385932192.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/260a9489-82c4-477a-b27d-86dc157c90f3/monster_inc_boo_costume_2t.pdfIn PDF document text
    • https://b81e1767-bb0d-4562-9f98-cfef66859bb1.filesusr.com/ugd/b48b60_32f9474d86cb4a4a8ce44ada5d1df9da.pdf?index=trueIn PDF document text
    • http://rasizukaxija.epizy.com/enfermedades_del_aparato_de_golgi.pdfIn PDF document text
    • http://zupupizejegujun.epizy.com/88038993171.pdfIn PDF document text
    • https://d3dd75b0-514a-4dbf-a1f7-973a5b421fb1.filesusr.com/ugd/5b46ec_6901e806fdbd4ad0a5174f1d8d42402f.pdf?index=trueIn PDF document text
    • http://wekumut.epizy.com/keteditujudowa.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FA 5316 bytes
SHA-256: f69b78cd6411b711ff0ed85ca02317c855afa53c5547cd7a44fb2d9dc7098a46
font_01_sfnt_off00010333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10333 11208 bytes
SHA-256: 3f4eeac74d34ee31558eb904860e93a6dc0613979ac59d33b9e161ac124caf12

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