Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfcbd604dbfcc14c…

MALICIOUS

PDF

97.1 KB Created: 2021-01-29 18:47:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3c14adce8dd343298190d82e1bc038e1 SHA-1: d994a22bdf46e0fce45eb9b7e67bfa3adc45bf29 SHA-256: dfcbd604dbfcc14cc8313741881b0e5dddb89ff82379a983269082d959a9f972
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to potentially harmful content.

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/123?utm_term=it%2527s+not+a+boulder+it%2527s+a+rock PDF link annotation
    • https://vaseviga.weebly.com/uploads/1/3/3/9/133986607/623899.pdfIn PDF document text
    • http://minuette.me/apa_manual_deutsch2rcjv.pdfIn PDF document text
    • https://cdn.sqhk.co/genizataxom/eibm1ic/ice_age_village_limited_animals.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424331/normal_5ff6cfe61d3b2.pdfIn PDF document text
    • http://wukebejajixajen.iblogger.org/xiwuzexowefukuri.pdfIn PDF document text
    • https://gisogademumes.weebly.com/uploads/1/3/1/3/131379615/1462291.pdfIn PDF document text
    • https://bonawuxuje.weebly.com/uploads/1/3/0/7/130776103/vabozelevifumolu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449603/normal_5fe8f360620a7.pdfIn PDF document text
    • https://modizotu.weebly.com/uploads/1/3/2/7/132740501/bibezi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469353/normal_6012c0281cde9.pdfIn PDF document text
    • http://obsluzhivanie-kompyuterov.moscow/mastose_mammaire_et_stressrofnj.pdfIn PDF document text
    • http://hdvideo.design/simulator_for_brawl_stars_mod_apk_unlimited_moneybhwml.pdfIn PDF document text
    • https://cdn.sqhk.co/kiraxozi/7jefeia/power_pop_bubbles_apk_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457876/normal_600f4bd04dc5d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://babematalal.epizy.com/bollywood_all_actress_hd_wallpaper.pdfIn PDF document text
    • http://safodur.epizy.com/facebook_camera_effects_platform.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_off00013ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDF 5108 bytes
SHA-256: 168a4e6d857404b09c27b9d55a143ba498c10d7c5bf561713608a1e9198d3ef1
font_01_sfnt_off00014f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F50 12012 bytes
SHA-256: b26f89104c9ec0f837fda36877762efb6f1154541be8fff06fdff7e50a928c02

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