Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1fbe7ece93e9cc4…

MALICIOUS

PDF

90.0 KB Created: 2021-03-14 22:28:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 815e49b3e3879e6d5ec1b5ca04f24b4c SHA-1: e4170b462252ac70e5b140e9374b42911eaa5ad6 SHA-256: f1fbe7ece93e9cc44d795b65f422fb5c73b4b58525c11923189e1a660fd84f19
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' heuristic and ClamAV detection. The primary malicious URL identified is https://mezovuduw.ru/award?keyword=cylindrical+coordinate+system+problems+pdf, which is likely used to host a phishing or malware payload. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/award?keyword=cylindrical+coordinate+system+problems+pdf
    • https://cdn.sqhk.co/womawuxinuge/ejhwSje/sniper_killer_3d_game_free_download_for_pc.pdf
    • https://bululuxoragoxoj.weebly.com/uploads/1/3/0/9/130969030/surakabatop_lifuxega_kotogorog_welaguvefa.pdf
    • https://cdn.sqhk.co/tezofugowura/cCrjdhc/telegram_groups_for_movies_2020.pdf
    • http://casser.xyz/dofokoxeraminegodimjdmiz.pdf
    • http://vermono.site/zalamasejuwomorametalanarjgxb.pdf
    • http://letxxnx.org/tefezojg9jeg.pdf
    • http://deemonatrafik.xyz/59116775909v7e34.pdf
    • http://bullbananavannaone.xyz/que_es_un_lider_cristiano_evangelicoxnkut.pdf
    • https://mezepobavufu.weebly.com/uploads/1/3/4/7/134717124/nikijiranejosanam.pdf
    • https://wuguxobexo.weebly.com/uploads/1/3/0/7/130739488/5f3623d322382f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2ae8fa2d-8b21-4cd7-bd94-b44763fb9b4d.filesusr.com/ugd/8e1ec7_4daca953e2204011919a88b39013c698.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dfc65a17-d815-43ab-8e1f-70a05af3e72e/real_heart_drawing_easy.pdf
    • https://uploads.strikinglycdn.com/files/cba513ec-2e0b-4251-8f53-2dc718536e0e/84935453299.pdf
    • https://9e7b01ce-91ce-414a-93c5-ade8df4b7359.filesusr.com/ugd/cfbfd2_b5cade17be404f39b0247a526008b468.pdf?index=true
    • https://f6142301-0c02-44dd-b2c5-62cf9b3cd0dc.filesusr.com/ugd/ebfdba_12be377b58ab4dbdb155f2794195b213.pdf?index=true
    • https://b724dda4-e2e0-47c5-811c-ae3b7273578b.filesusr.com/ugd/a1e5ee_6f1adba42a9e48f2a0ac0363c578e943.pdf?index=true
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_4601d5a82e554b93909695a0ea76021f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c13961c3-7cb0-4788-8111-f04fe0fc3feb/what_movement_does_citizen_use.pdf
    • https://d09251a9-b09e-4077-8ccb-24037f005f7b.filesusr.com/ugd/a6ce17_4eb577c1b7f046b19f7edd24b5e954ff.pdf?index=true
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_01643113f2644df9aec094a049e1ff72.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_off00011dba.bin
2980fa240b96a3c67b2c33c0043fda319a16e9480bf3dd19ac512b350bfd3072		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBA 5448 bytes
font_01_sfnt_off00013026.bin
3405ca77b2043b67e5bb1b40e24ca3110d8297acb60e4509b075270304955833		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13026 12364 bytes

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