Malicious PDF — malware analysis report

Static analysis result for SHA-256 00aabd512b80f719…

MALICIOUS

PDF

78.4 KB Created: 2021-03-20 23:57:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac7be1dec60877fd9f960601b8e6e7f3 SHA-1: 20884de97954eff06b5e99cb5ffdffd330b37478 SHA-256: 00aabd512b80f7194f17153207c3193e60062be77b9d93bbbcbf1e1f48a3c3cf
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing indicating a mass external link farm, with one prominent link pointing to 'zajinet.ru'. The document body, though heavily obfuscated, contains text related to 'Netgear n150 router setup', suggesting a lure. The presence of external links and the ML classifier's high confidence score indicate a malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/strik?utm_term=netgear+n150+router+setup
    • https://cdn.sqhk.co/zevijevam/jiaAif2/21596916408.pdf
    • https://cdn.sqhk.co/vovewotutal/4dX2n64/zofepofolusuzimojo.pdf
    • https://cdn.sqhk.co/xamitarerivu/J7Whdec/4242672142.pdf
    • https://cdn.sqhk.co/temetixufuxi/cHhafgc/28939503940.pdf
    • http://wudenufodoroziv.scienceontheweb.net/aditya_hrudayam_stotram_in_gujarati.pdf
    • http://dufifudusimube.mygamesonline.org/m-audio_keystation_pro_88_manual_espaol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_5c4728724d7f43e38fda8950c7778c00.pdf?index=true
    • https://s3.amazonaws.com/memobofilenabon/high_definition_audio_bus_driver_windows_10_64_bit_amd.pdf
    • https://uploads.strikinglycdn.com/files/62186efd-fc62-485f-97be-de6d773d78a3/4_words_game_level_21.pdf
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_d983b869171b4207a00ec003aa895022.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0f755178-8f84-4cfa-9481-91af4ce162cc/2789481917.pdf
    • https://s3.amazonaws.com/farefasejikap/prefect_letter_of_application_template.pdf
    • https://uploads.strikinglycdn.com/files/e49cab11-53fe-4688-96ab-68fb5ec0c761/ar_15_rifle_case_36.pdf
    • https://s3.amazonaws.com/tevigotu/miller_211_spool_gun_polarity.pdf
    • https://s3.amazonaws.com/bodajaku/bhavani_chupulatho_dj_song.pdf
    • https://uploads.strikinglycdn.com/files/8bc77a80-1188-4dba-82c8-932740e776b5/what_religion_is_your_bra.pdf
    • https://uploads.strikinglycdn.com/files/efe7caec-9c38-4451-b429-6ac815af5cd1/how_to_do_oll_and_pll_at_the_same_time.pdf
    • https://uploads.strikinglycdn.com/files/032d411d-53ff-4572-a0a5-9cf6c07d1201/84120251020.pdf
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_816207a4408e414eb8b5c937d2f3a28e.pdf?index=true
    • https://s3.amazonaws.com/wolina/what_is_27_weeks_pregnant_in_months.pdf
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_70b09dcfccdc41c8bc0c084a44a23a57.pdf?index=true
    • 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_off0000f5a4.bin
4bf27083c951c2b63a2b3300dd34f081a0d427671d9794abff3623d06192f23e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A4 5244 bytes
font_01_sfnt_off00010796.bin
6dadae5710901014ff3ff7860bcd0cf6f200e84820290e6a872cb3bb187190ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10796 10884 bytes

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