Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d6efc72ac07ae1b…

MALICIOUS

PDF

79.6 KB Created: 2021-02-22 08:34:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cca4382032c8fa98dd0f8faf065675a6 SHA-1: c08b150a24f6e579ff6c6966f6ff9d4a8df4c903 SHA-256: 1d6efc72ac07ae1bb22470b3136a27b3a40a6ddb85763cfff6751fda8e8f2753
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous external URIs, including one pointing to 'jacksth.ru', suggesting an attempt to redirect the user to a malicious site. The document body, though heavily obfuscated, appears to be a lure related to a user manual, aligning with common phishing tactics.

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://jacksth.ru/strik?utm_term=samsung+un24h4500afxza+user+manual
    • https://vafumesaz.weebly.com/uploads/1/3/4/5/134589630/3755429.pdf
    • https://cdn-cms.f-static.net/uploads/4380699/normal_60242c24c72ee.pdf
    • https://static.s123-cdn-static.com/uploads/4409093/normal_60045a399e7ef.pdf
    • https://jezaxegare.weebly.com/uploads/1/3/1/3/131380636/21961.pdf
    • https://babipuwoze.weebly.com/uploads/1/3/4/8/134865032/13b396d.pdf
    • http://gmetry.online/36946444472uyosq.pdf
    • https://suzonozumevudem.weebly.com/uploads/1/3/1/3/131379217/kuvofepaxufixo.pdf
    • https://tojewenegekov.weebly.com/uploads/1/3/4/5/134502344/paxitomobuse.pdf
    • https://cdn-cms.f-static.net/uploads/4366993/normal_600cff6eeb93f.pdf
    • http://cuzinfo.ru/engineering_leveling_guide_8._2j4cer.pdf
    • http://s7hmus.org/sipiwowawinogatubepef5eita.pdf
    • http://nibelv.xyz/aws_s3_bucket_as_zipke4ql.pdf
    • http://avit0.pro/ditamibexikbxuam.pdf
    • http://wumorumomu.22web.org/lijakasufanoselavaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gufobipadu.epizy.com/35517346190.pdf
    • http://bizewegomakak.rf.gd/toefl_paper_based_test_practice.pdf
    • http://budokukikaririd.rf.gd/cercle_cagliostro.pdf
    • http://jadupapobixe.epizy.com/26056084792.pdf
    • http://jexonuwunow.epizy.com/benchmark_performance_test_online.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8be.bin
cdd931ecc7aae2cc347966f65ee59a0e10e2410a259316ce3e38738b9ec358a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BE 5888 bytes
font_01_sfnt_off00010cbb.bin
7a68e10bca82be2dcfd4a470f15dede8506e230806f3250d0b5c0ce603f0c6a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBB 10624 bytes

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