Malicious PDF — malware analysis report

Static analysis result for SHA-256 12dcb87d8ba87cfd…

MALICIOUS

PDF

76.1 KB Created: 2021-02-05 23:40:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0d937a58d0a955336f5e74db45fdb6ac SHA-1: cfaa7cef02effbfca65b19f3f53ecd8d010c5d07 SHA-256: 12dcb87d8ba87cfddb08f6ecbd17c4c4abd030c17c809b2c427d48f388b53ba8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many pointing to disposable hosting services, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated, but the presence of external URIs and the overall structure strongly suggest an attempt to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • 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/123?utm_term=field+and+stream+rut+report PDF link annotation
    • https://jufavufopu.weebly.com/uploads/1/3/4/3/134340263/b25ba50.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486368/normal_5ff00b91e8480.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373527/normal_5fdd7d2d84a02.pdfIn PDF document text
    • https://mikotefi.weebly.com/uploads/1/3/2/6/132695671/gedivuvigemutujol.pdfIn PDF document text
    • http://vatemuredaxusob.22web.org/18198188935.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444885/normal_600238769e108.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455672/normal_5fea1c8a66fbd.pdfIn PDF document text
    • https://tofibuji.weebly.com/uploads/1/3/5/3/135309424/bonapek-titesurutofekes-lopogamo.pdfIn PDF document text
    • https://cdn.sqhk.co/noxivudeva/jehfgeQ/space_squid_club_penguin_rewritten.pdfIn PDF document text
    • http://secret-empire.ru/nuxobivirmodd4.pdfIn PDF document text
    • http://sayseedokg.com/proverbes_anglais_franaisgmp30.pdfIn PDF document text
    • https://suwesinorilofev.weebly.com/uploads/1/3/4/0/134096988/vufugupulefigi.pdfIn PDF document text
    • http://jisuwadizo.22web.org/tamil_amman_padal_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/blue_planet_2_all_episodes.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/acknowledgement_for_reports.pdfIn PDF document text
    • http://zujugefov.rf.gd/51421983204.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/vosudipipix.pdfIn PDF document text
    • http://nakepusigazu.epizy.com/43944007624.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_off0000e9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DF 5060 bytes
SHA-256: 11fe5e2e0d47c8120d2d100965174f5c983dd462671e29ef66233e88d2593f4f
font_01_sfnt_off0000fafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFB 12032 bytes
SHA-256: cae715898ffa278a13750fdb9f228e4aa46493e77483129ee35729f5b499a1be

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