Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf6804370b136ac3…

MALICIOUS

PDF

73.3 KB Created: 2021-03-03 02:51:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 782f8b110a152392f161744e1da654d1 SHA-1: b26aecad43c3bf410a6fbcb7c358549e02fbd6f2 SHA-256: cf6804370b136ac3d7f18ee640be5f64e6a7139e3c5ebffcf60f27ff52efd23a
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to suspicious domains, suggesting it functions as a lure to phishing or malware distribution sites. The PDF structure and the presence of external URIs indicate it's designed to redirect users, likely as part of a phishing campaign.

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/wix?keyword=lawrence+ferlinghetti+coney+island+of+the+mind+pdf PDF link annotation
    • http://mon-cmbretagne.com/pawegimibemitolewilevilww0b.pdfIn PDF document text
    • http://activa-fb.com/sesesibepopumuvifikugajeztp2g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469143/normal_5fca9d8ec6274.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372361/normal_5fc63ba14d9ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367925/normal_5fd620aa5b79d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469837/normal_5ff8608608155.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387420/normal_6019ce2cd3f27.pdfIn PDF document text
    • http://ses-paypal.com/swtor_mods_guide1a7k7.pdfIn PDF document text
    • http://axecheat9.xyz/793463360616jp8c.pdfIn PDF document text
    • http://winoorama.site/what_should_a_case_summary_includehg30q.pdfIn PDF document text
    • http://soul-felt.com/bifemavelgc49.pdfIn PDF document text
    • http://kprovk.xyz/beechcraft_turbine_duke_performancegnqp7.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_off0000e188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE188 5704 bytes
SHA-256: f1f679604107c3038422e042b57a215f974fed8822f8c8f2a6466885e8d8ecee
font_01_sfnt_off0000f4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E5 10468 bytes
SHA-256: ecb85c644437a9a71799f220b9d171c4ee53a4468ed63614ccc01e5feb5a6cb5

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