Malicious PDF — malware analysis report

Static analysis result for SHA-256 ada16193a4d4d132…

MALICIOUS

PDF

72.4 KB Created: 2021-02-11 16:49:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e1fdc885a69031e522ae7bd27a15aece SHA-1: 673f90e5f64e50d0e0bce51cb09f9115f7e63ed1 SHA-256: ada16193a4d4d1325f5fc8507285a3789dfbc3b8e9f108c4aedf78bae78fad1b
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the extensive link farm suggests a primary goal of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=cristiano+ronaldo+weight+training In PDF document text
    • https://mosovokiz.weebly.com/uploads/1/3/4/3/134333023/7698257.pdfIn PDF document text
    • http://selectgetc.top/rawurazituzozerovuzewetajza3a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366009/normal_5fc8a06c11c3c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491398/normal_5fe528790cd5e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366043/normal_5fcd32b31e3bb.pdfIn PDF document text
    • http://pl50off.info/98820965889kauvs.pdfIn PDF document text
    • http://connexion-amelii.xyz/cad_2010_keygen_freeoouq6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384145/normal_60021d244b8a6.pdfIn PDF document text
    • https://roxagidu.weebly.com/uploads/1/3/4/7/134748987/3530397.pdfIn PDF document text
    • https://jorevubo.weebly.com/uploads/1/3/4/8/134869484/wifosunewikiwup_pafujexapam_xixuxekumoxive.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412593/normal_5ffffa58b968a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469375/normal_601ce2ee07b7f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366388/normal_5ffb14965b7e2.pdfIn PDF document text
    • https://bipinudaw.weebly.com/uploads/1/3/4/7/134718108/d0989.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406775/normal_5ff08d0c64678.pdfIn PDF document text
    • https://lemefiware.weebly.com/uploads/1/3/4/0/134017231/narikexivalumi-lalojapud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446761/normal_60119b34a538b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467945/normal_601dbb09924f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420907/normal_5ffa1f338f5a9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000de6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6D 5084 bytes
SHA-256: ef351d3b6ac609904fb66c898df1b38f85995b09e6396b493438105b584e78f7
font_01_sfnt_off0000efb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB8 10820 bytes
SHA-256: a898e3172bacea635c1af95432ac04337439e5bd9657cfee41f8439b93698ca9

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