Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dc25f419a495911…

MALICIOUS

PDF

68.1 KB Created: 2021-03-05 19:06:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5b1922fe609e29410ac60a362d79210e SHA-1: b38d5578f9c83c2d73e6ec3ac9a712e62de18e28 SHA-256: 2dc25f419a49591179970fc483d1ac9f6e8e615fdaa3ebf024534549413daa7b
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document appears to be a lure, using the guise of a free legal textbook download to direct users to external URLs. These URLs are likely part of a phishing or malware distribution scheme, as suggested by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/wb?keyword=street%20law%20a%20course%20in%20practical%20law%20pdf%20free%20download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378167/normal_60334424b34f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403952/normal_600ba97156603.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/dhb7gcN/screen_lock_time_password_pro_apkpure.pdfIn PDF document text
    • http://white-x.fun/wejoduwo2kvlw.pdfIn PDF document text
    • https://zuwuloju.weebly.com/uploads/1/3/2/6/132681456/1061227.pdfIn PDF document text
    • http://sadovik.me/27544202628ly6qp.pdfIn PDF document text
    • http://myyshooop227.site/53097233195l9h4.pdfIn PDF document text
    • http://gagarinski.su/747725877826p1i0.pdfIn PDF document text
    • http://pay-order.info/74394759933fox8b.pdfIn PDF document text
    • https://visorupa.weebly.com/uploads/1/3/5/3/135305290/suvasajubawesebox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461780/normal_600a74f7ed93d.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwetebep/njaDFji/rixoxuvoxavemuwajuwux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380230/normal_6006a8bc4b45f.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_off0000cbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC3 5344 bytes
SHA-256: 927e8ad1b0942219bde1b967f8d63b22eb8147890ce924bb94d83ab1e46cd604
font_01_sfnt_off0000de12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE12 10364 bytes
SHA-256: e93ec4af17e6783cbabb3f2e47275bc83e575367c430f62bfbea26c5c698704a

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