Malicious PDF — malware analysis report

Static analysis result for SHA-256 03624ab82b5b498c…

MALICIOUS

PDF

76.9 KB Created: 2021-03-20 19:27:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 21b339f3233ad16afde4a3cec199b5da SHA-1: 3063cf74bb5197ad368969397935f9d350e3c9d6 SHA-256: 03624ab82b5b498c4fb7140cac534beb2eae60803c8ec90f21fe3be2c05051e2
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it functions as a link farm or SEO manipulation tool. The embedded URLs and the document's structure point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/award?keyword=affairscloud+monthly+gk+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375076/normal_60084a3e7fc6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452377/normal_5fc5addd030b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369331/normal_604b9a280db88.pdfIn PDF document text
    • http://wiwikiru.iblogger.org/how_to_open_a_supra_c_lockbox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421200/normal_60491029c8f4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366336/normal_6034f8f650ee1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479435/normal_600af93226a7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494149/normal_5fdfd5eea2a6d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/65853689266.pdfIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_048792b0f8e845f497a4a99ba0ce12cd.pdf?index=trueIn PDF document text
    • https://29c5b005-6627-40e3-9da1-9f9d3dbc34dc.filesusr.com/ugd/7ad284_997f729a502a4d90a72e3ecd486444eb.pdf?index=trueIn PDF document text
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_1edc724431594001b22061b5a4a073dc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jezobasit/the_elite_kiera_cass_characters.pdfIn PDF document text
    • https://c24d0846-efa5-4754-a822-a7dc8f88f2d4.filesusr.com/ugd/7b2abd_3168db559c9241a196b4167a22651bb0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/kewumunumejezobudumutu.pdfIn PDF document text
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_c12da36f6e574f5b9aa0e052e37a9f84.pdf?index=trueIn PDF document text
    • http://bevowamudad.epizy.com/77549034944.pdfIn PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_eb05e15f027f40748d3fa16408f69710.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_off0000ee22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE22 5724 bytes
SHA-256: ad92e0c5dc0695738141b6e6282344678ce576985c44a6f7512bffdc0c41c582
font_01_sfnt_off00010183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10183 10940 bytes
SHA-256: 87fd5e7db868073e49b365cce68c017b2579452e72145beb66d523e5d9e49523

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