Malicious PDF — malware analysis report

Static analysis result for SHA-256 2787e0c738fae1f2…

MALICIOUS

PDF

78.8 KB Created: 2021-03-19 19:06:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcb6d58bf7ab0a8b529e395905fa64e2 SHA-1: 9fbc2d31bb692b97bea18dafba15a4f99890e5fc SHA-256: 2787e0c738fae1f288885386892bf2bc8d9fb4325a6e62f02cfe7298acc11366
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, forming a link farm designed to direct users to various other PDF files hosted on external services. The primary URL, 'https://kuzutuzo.ru/wix?keyword=google+docs+movies+list', appears to be a lure, and the embedded link farm suggests a phishing or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/wix?keyword=google+docs+movies+list
    • https://nibevomixosu.weebly.com/uploads/1/3/4/1/134108547/6286f9b.pdf
    • https://famepajovajegow.weebly.com/uploads/1/3/1/4/131438188/4034381.pdf
    • https://sogitinavebifi.weebly.com/uploads/1/3/5/4/135400198/5568209.pdf
    • https://dusomekekonipa.weebly.com/uploads/1/3/4/5/134580960/posogobe.pdf
    • https://pirulavedup.weebly.com/uploads/1/3/1/3/131379447/18d691aa.pdf
    • https://rogenogenitel.weebly.com/uploads/1/3/4/3/134316557/jebusojijan.pdf
    • http://sozimaxetupow.mywebcommunity.org/what_are_some_good_bible_scriptures.pdf
    • http://deliwubavamir.mypressonline.com/83135258122.pdf
    • https://nizifaweneli.weebly.com/uploads/1/3/4/5/134589853/1fa75872704d56.pdf
    • https://pebufaso.weebly.com/uploads/1/3/5/4/135400671/zewog-segezasakis-pegebasol-figil.pdf
    • https://jekosupoma.weebly.com/uploads/1/3/1/6/131637113/vesatibilezokara.pdf
    • https://bunofavaluz.weebly.com/uploads/1/3/4/6/134661637/f58bf638c28.pdf
    • https://tapuwapefozex.weebly.com/uploads/1/3/4/3/134350869/ruvokomadenigejimuj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/pirofopafu/chip_s_challenge_2.pdf
    • https://s3.amazonaws.com/zonivezada/93855670845.pdf
    • http://nixomirorubu.myartsonline.com/attitudes_to_language_garrett.pdf
    • https://s3.amazonaws.com/womirofop/75408408008.pdf
    • https://s3.amazonaws.com/kubafezin/shuten_doji_onmyoji_guide.pdf
    • https://s3.amazonaws.com/gidibesuxi/3d_max_tree_blocks_free.pdf
    • https://s3.amazonaws.com/gotijejaj/funuxunowulazuxosudusu.pdf
    • https://s3.amazonaws.com/debiwelof/embolism_pulmonary_guidelines_2019.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb57.bin
14aa71161a51113cbbc0287f773328c881a837ac1d96760b23fe82c14a25bc1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB57 4728 bytes
font_01_sfnt_off0000fb83.bin
8319fb3270aad02e84944eeb587432659cba3e31ae4cb9090abbaff961e0d24f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB83 10564 bytes
font_02_sfnt_off00011fac.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAC 4324 bytes

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