Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c49bb569a90bff…

MALICIOUS

PDF

114.0 KB Created: 2021-05-27 13:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34ac5b6869504c8f963c0d625190cc1c SHA-1: 43a4a227bfacbca06f6be0c06463cc8b33f2ebda SHA-256: 21c49bb569a90bffc48801db369716837c9d65b5cbd91001eb941e7bc7e37fc8
156 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating it is part of a link farm designed to direct users to external websites. The embedded URL 'https://kuzutuzo.ru/strik?utm_term=gba+emulator+ios+14' is presented as a search result for a popular topic, likely to entice clicks. ClamAV and ML classifiers also flagged this PDF as malicious, suggesting it's a phishing or trojan delivery mechanism.

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/strik?utm_term=gba+emulator+ios+14
    • https://cdn-cms.f-static.net/uploads/4495390/normal_604e629acb9ff.pdf
    • https://xanowiporak.weebly.com/uploads/1/3/0/8/130814060/2872139.pdf
    • https://static.s123-cdn-static.com/uploads/4445532/normal_5fde0b13ca54a.pdf
    • https://rapalavosifezo.weebly.com/uploads/1/3/4/8/134886177/2efbc1cf27eafc.pdf
    • https://balijijileg.weebly.com/uploads/1/3/4/5/134505585/vowulasirije.pdf
    • http://www.typoland.com/http://www.typoland.com/designers/Lukasz_Dziedzic/Copyright
    • http://www.typoland.com/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3c9cfe9a-05c5-4167-9441-ce3248e0e14b/cules_son_los_7_libros_apcrifos.pdf
    • https://uploads.strikinglycdn.com/files/2ddcca8c-27c5-4c81-9907-fdc4d9c354a2/what_is_the_return_type_of_constructor_in_hindi.pdf
    • https://uploads.strikinglycdn.com/files/4db48250-a61d-46b6-b978-37bdd77f5b74/nusapinotad.pdf
    • https://uploads.strikinglycdn.com/files/ebb1a97a-6114-46a2-9a39-f0672942979b/multiplication_table_chart_printable.pdf
    • https://uploads.strikinglycdn.com/files/7a44a141-c96e-4df6-85cb-c592c8da93b5/98357695496.pdf
    • https://uploads.strikinglycdn.com/files/dca79dea-7ecf-4db9-b495-8277cb54812b/30038347209.pdf
    • https://uploads.strikinglycdn.com/files/f3a66374-4c24-4cde-a13b-2b363a3bf66b/ccna_tamil_tutorial_free_download.pdf
    • https://uploads.strikinglycdn.com/files/3b216322-c1f3-453e-b860-e77c9070de17/ziveduwolurimitegazenojil.pdf
    • https://uploads.strikinglycdn.com/files/bb2a8a71-f8c1-447a-948a-bb79b10ca41d/rhyming_dictionary_online.pdf
    • https://uploads.strikinglycdn.com/files/59b57729-6b0b-4979-8d3a-9ca4d0f9c58a/katha_upanishad_chariot_metaphor.pdf
    • https://uploads.strikinglycdn.com/files/f009dcd6-9461-4823-ab2c-5842adc6cdcc/fodesupesosewa.pdf
    • https://uploads.strikinglycdn.com/files/533abf2f-7c91-47c6-b307-fe56ca3609c4/how_to_find_a_freelance_writing_job.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014316.bin
50bd8db5ff9a0f03ea6ac0366ab4ff273dceb6ff0c6101ac0faff1fd52ccc92d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14316 6168 bytes
font_01_sfnt_off00015288.bin
04d9cdb621fbeea35b027181f9a0a7e4d75cc856554eb470d85dcc90dcdd2b4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15288 11592 bytes
font_02_sfnt_off000178c2.bin
63c297e689ff3a87ae766c8523be2ea0c1863c1051c303f84dffcffa3fd3cd32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x178C2 5144 bytes
font_03_sfnt_off00018a32.bin
e497aee6090e9f83e8833014409706394649a9deaab358395dbf2dfb7b5783b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18A32 15396 bytes

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