Malicious PDF — malware analysis report

Static analysis result for SHA-256 603cd0cc31f4eb6a…

MALICIOUS

PDF

72.7 KB Created: 2021-03-31 16:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19ffc920fbc84f3e4cef6dc0ab146738 SHA-1: 7940dd5c1dbcf9f4b2166274cdaf471a39c03ea7 SHA-256: 603cd0cc31f4eb6a8c1477917a6b1e9c955f857747a1256ba63abb5a6b0912c5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one prominent URL pointing to a suspicious domain ('jumiwimov.ru') that is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to generate traffic or host malicious content. While no scripts were explicitly extracted, the nature of the links and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings strongly suggest malicious intent, likely related to phishing or malware delivery.

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://jumiwimov.ru/wix?keyword=nomenclature+worksheet+%25232+%2528bmc+and+bic%2529
    • http://gufutaca6.xyz/8702895299qy4f4.pdf
    • https://cdn.sqhk.co/pigevikuwi/dB55BTU/fire_balls_3d_best_games.pdf
    • https://cdn-cms.f-static.net/uploads/4485014/normal_6046d860b2b21.pdf
    • https://cdn-cms.f-static.net/uploads/4489054/normal_6043bafe9fc5d.pdf
    • https://cdn.sqhk.co/nenutipu/RJjgxFT/activex_control_for_internet_explorer_10.pdf
    • https://cdn.sqhk.co/sobetevod/CqJwxhg/kasesas.pdf
    • https://cdn.sqhk.co/baxijaxazixi/ihghVia/bivekiwusupom.pdf
    • http://pokupka.space/what_is_covid_19_in_brief3gtmi.pdf
    • https://cdn-cms.f-static.net/uploads/4391308/normal_60462705c6e9e.pdf
    • http://shopsupergood.site/black_and_decker_chv1410l_batterylt1yb.pdf
    • http://complerbnp.com/25732260703ri8e2.pdf
    • https://static.s123-cdn-static.com/uploads/4367281/normal_5ffbab480b17b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/piwupevivotixi/teori_komunikasi_behaviorisme.pdf
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_4058b2c09b5040b4ba283c8c99e6bebf.pdf?index=true
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_9395b988fcf041cb9bc4fc1a202d3d31.pdf?index=true
    • https://48bd7725-9370-4d18-884e-e75d7b70c9c4.filesusr.com/ugd/f241d9_109255b6ddf6409fb5f9df116aeb6f4c.pdf?index=true
    • https://s3.amazonaws.com/zozuxukoxo/lawunamixusatejofasixe.pdf
    • https://s3.amazonaws.com/tipikaxe/rakufexegeremiselolazi.pdf
    • https://s3.amazonaws.com/purixifusipelid/33417902474.pdf
    • https://s3.amazonaws.com/varolexexus/figurative_language_examples_sentences_alliteration.pdf
    • https://s3.amazonaws.com/subopukomanaw/african_queen_fakaza.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dedf.bin
bcdb84e56071f2ad353b8d620253d4ca22c0cca53e6a307ee227c8f3ad431218		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDF 5164 bytes
font_01_sfnt_off0000f059.bin
fbcb2e58dceaf0f54c3da6d6d79294eaacc7ab73fb5f8d7e672a564f9891a91e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF059 10984 bytes

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