Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb0a16a6c786017…

MALICIOUS

PDF

79.1 KB Created: 2021-02-27 05:28:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08aea5f704e5c3708b08ab27d4bc74a2 SHA-1: 28c3e5cb862aabaec1dd8399396e8ea36e75b446 SHA-256: bcb0a16a6c7860175b00affedf91817864b1c09150a3607812cc1ec8de9a0501
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or a distribution mechanism for malicious content. The ClamAV detection and ML classifier further support the malicious nature of the file. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content.

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://resalured.ru/strik?utm_term=free+elementary+map+skills+worksheets
    • http://slimerecipe.org/auto_chess_apk_mod9snar.pdf
    • https://cdn.sqhk.co/rozesivotix/digNwzz/sifefafij.pdf
    • https://cdn.sqhk.co/fofesali/cijhnpf/vaxiniwunafar.pdf
    • http://stikc.xyz/8372825276565772.pdf
    • https://lekifusa.weebly.com/uploads/1/3/1/3/131382118/kimugijepurir.pdf
    • http://sun-italy.space/pentair_superflo_pool_pump_leaking2xnii.pdf
    • https://cdn.sqhk.co/tovozovuzedu/bghgcHs/pukesagaxivizate.pdf
    • https://cdn.sqhk.co/wotedimozer/STgMpgf/metukux.pdf
    • http://winoorama.space/tamilrockers_hd_hollywood_movies_2018_freelzchr.pdf
    • http://figuxovutofid.mygamesonline.org/jezasas.pdf
    • http://thechambre.xyz/lubarodagaronimermy25.pdf
    • https://cdn.sqhk.co/tinajugezepi/jdr0Bgi/rummikub_online_facebook.pdf
    • https://cdn.sqhk.co/kopilixa/xjjFifV/guradogupoxigelosa.pdf
    • http://wapividazofar.scienceontheweb.net/64594109335.pdf
    • https://nakalefa.weebly.com/uploads/1/3/4/5/134522788/kapelafimif.pdf
    • http://vekvelo.ru/bl2_haderax_the_invincible_guide4u25v.pdf
    • https://pabaxovazat.weebly.com/uploads/1/3/4/3/134323574/4607840.pdf
    • http://peromopativej.mypressonline.com/23345592995.pdf
    • http://vertigoa.online/wonoterefa2ds.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://lobopekogolo.onlinewebshop.net/74429756908.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_off0000e947.bin
276ae65fd2381e2ad963d44e6188243628650de680c2b881726efefd74652c68		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE947 5060 bytes
font_01_sfnt_off0000fa5d.bin
3887de18049ba01fba12f4ef54fb145f92d2662d4a4058ade2f84c1b78170fed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5D 11260 bytes
font_02_sfnt_off000120a3.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120A3 4324 bytes

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