Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a392897c4e4bcbd…

MALICIOUS

PDF

72.4 KB Created: 2021-02-22 20:49:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 8191c22a0b6fe5ea9cec2c73ad327764 SHA-1: 9fa0a5c3189ab962aca79d4dc05c1cc22bc7f0b0 SHA-256: 0a392897c4e4bcbdf2da6c6278d81ff2dcf6b66c1fbd870f111d2a50acfb53ca
126 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs, many of which point to disposable hosting and are likely used for phishing or to distribute further malware. The presence of embedded URLs and the overall detection as a phishing/trojan PDF strongly suggests a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=2005+cadillac+cts+engine+ticking PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4471083/normal_5fd096541274b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453563/normal_601095771f7d4.pdfIn PDF document text
    • http://wowit.pro/vumidezapuwenoluxugarofescs07a.pdfIn PDF document text
    • http://reetodo.online/msc_biochemistry_questions_and_answershc7dh.pdfIn PDF document text
    • https://vedalamiru.weebly.com/uploads/1/3/0/7/130776143/a3c1b.pdfIn PDF document text
    • https://xasukibumit.weebly.com/uploads/1/3/4/7/134749231/7847fd51055241f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388156/normal_5fdf64a09045f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490539/normal_601df5ca95afc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387573/normal_6000b2cfdd1b2.pdfIn PDF document text
    • https://jalesebexiw.weebly.com/uploads/1/3/0/7/130739560/40e68e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379240/normal_602eaa45f0c90.pdfIn PDF document text
    • https://fiwisito.weebly.com/uploads/1/3/4/7/134715438/2b6e9ac5328.pdfIn PDF document text
    • http://repair-kvadrokopterov.ru/99011772839xoqhm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sojisij.epizy.com/keynote_template_ipad_pro.pdfIn PDF document text
    • http://vaxutusurinav.epizy.com/81519940488.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_off0000de3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3C 5376 bytes
SHA-256: 5fa8e46ac60cb0fe6fa6822f1c2c77f23a0020a99559b33cc01c1a1e9294ffe5
font_01_sfnt_off0000f0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A0 10592 bytes
SHA-256: 5939a8dbae6719f114a61ca10a20fcc17345ecf6fb2142915e99d570237f0dc5

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