Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8e829b5ce63843…

MALICIOUS

PDF

76.3 KB Created: 2021-03-04 06:35:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 19c3b25d332a614a8da4dc9ecf4a31cf SHA-1: 935bcbce8a498a5d8c693b39f6230d1e72c89142 SHA-256: 5a8e829b5ce63843bfb7c4159171fff72c4d6532906f2aa0cfd0dc1006257094
166 Risk Score

Malware Insights

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

This PDF document contains multiple external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload.

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://resalured.ru/123?utm_term=how+to+install+nexus+mods+skyrim+special+edition+steam PDF link annotation
    • http://ionatr.space/belobizupidijegulepevkq2f0.pdfIn PDF document text
    • http://carishr.com/reading_comprehension_activities_for_1st_grade5ch98.pdfIn PDF document text
    • http://rasprodavaika.ru/fulekuxifiteyjigc.pdfIn PDF document text
    • http://wspring.space/lopivuvadenibineje4kvm.pdfIn PDF document text
    • https://mikofamix.weebly.com/uploads/1/3/4/8/134882663/1747219.pdfIn PDF document text
    • http://werenntaq.online/ted_dekker_circle_series_in_order30pwt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466680/normal_6034f2cf401f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368506/normal_5ffa1d5738e29.pdfIn PDF document text
    • https://wotujajatedigi.weebly.com/uploads/1/3/5/2/135295120/1a454a1bfea78.pdfIn PDF document text
    • https://xuwogojike.weebly.com/uploads/1/3/1/3/131380868/1e1d4e1be7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470402/normal_602560fa50581.pdfIn PDF document text
    • http://moymagazin.xyz/344561582053a1dc.pdfIn PDF document text
    • http://smallita.space/flicker_free_serial_macum24t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368985/normal_5fefe3f09e07a.pdfIn PDF document text
    • http://feelslike35.com/46544462290c4064.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://firuxafuxu.rf.gd/chipset_gta_5_android.pdfIn PDF document text
    • http://melewurimepuja.rf.gd/88570091501.pdfIn PDF document text
    • http://famekemij.epizy.com/tascam_dp-006_manual.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_off0000ecf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF8 5508 bytes
SHA-256: 9910a7c894310c89537132da780d5b0b250575f539f23aee7d068082faecbe3e
font_01_sfnt_off0000ffb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB5 10468 bytes
SHA-256: 90e3165201d1a3972b893236c3ed3a70ab99e8c0f3e573a070e767922224a952

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