Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c1dad0a39fa6abb…

MALICIOUS

PDF

74.9 KB Created: 2021-02-24 08:03:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: fe4dc05ea2f006c32c5f6a5f9b90eef3 SHA-1: 772b9472f4486df11b406470428adf7fc1e17701 SHA-256: 3c1dad0a39fa6abbf8fb8e34ba9b0990c66ba885058a9850c6b38fdac80d1fe3
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document that contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://bologen.ru/strik?utm_term=how+do+you+get+a+job+at+salvation+army+ceo+make PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454558/normal_5ff4b69a08324.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376380/normal_60180fce38aaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375885/normal_602f507d8062b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490128/normal_5fe913cf3dceb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388813/normal_60247e1fa1487.pdfIn PDF document text
    • http://jiviwizun.iblogger.org/chilled_hip_hop_beats.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382793/normal_5fd1f4a873e5f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luxixeg.epizy.com/logo_quiz_answers_level_18_iphone.pdfIn PDF document text
    • http://vezigaje.epizy.com/13700613581.pdfIn PDF document text
    • http://romipozaxijida.rf.gd/lagu_kisah_cintaku_ariel_noah.pdfIn PDF document text
    • http://nuzabasere.rf.gd/chhota_thara_byav_main_hd_video.pdfIn PDF document text
    • http://magetamuwunaze.rf.gd/what_does_8000_btu_mean.pdfIn PDF document text
    • http://tuwafexom.epizy.com/neumonia_nosocomial_pediatria.pdfIn PDF document text
    • http://botasalipigu.epizy.com/922318292.pdfIn PDF document text
    • http://pobepogimivej.rf.gd/bolingbrook_police_annual_report.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E0 5756 bytes
SHA-256: 774d898702f5e905aa575f14e24279b4dd9c03af5f0ed5adffa116c498d8e2b1
font_01_sfnt_off0000f87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87B 11148 bytes
SHA-256: d83d018fa55e1811f2c1e0448b58c69aeaa708cc7281da13ff67ab2c01e2c841

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