Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f40c937adf51c86…

MALICIOUS

PDF

81.1 KB Created: 2021-03-06 02:25:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8633804b7888986669f337ef663aaf6e SHA-1: 7353ccd8a53ab5b7176dd6543e8283c3384a8b5c SHA-256: 9f40c937adf51c86a6744c96caa7746acfc33f116646660241ad0d92ca17e7a5
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a link farm detection and a critical ClamAV detection for a phishing trojan. The presence of numerous external links, including one pointing to 'dafemum.ru', suggests an attempt to redirect users to potentially malicious sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit users through deceptive content and external links.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/123?utm_term=walmart+photo+center+hours+sunday
    • http://nudistoff.club/business_management_chapter_17_quizletekbal.pdf
    • http://presentinsta.online/gafuwurabecclhc.pdf
    • https://dawipufa.weebly.com/uploads/1/3/3/9/133986453/4735814.pdf
    • http://akfb.online/707748389980m2k1.pdf
    • https://ginamelemu.weebly.com/uploads/1/3/4/6/134624442/fofugu.pdf
    • https://jupavovol.weebly.com/uploads/1/3/4/3/134314217/452331.pdf
    • http://pro-gram.pro/tunapagewepuxinejafonur04op2.pdf
    • http://creamwalls.online/tricaster_460_advanced_edition9s3zz.pdf
    • http://hamlikjorettoop.ru/why_isnt_my_hp_pavilion_x360_turning_on0w12q.pdf
    • http://luminar4-download.xyz/fallout_4_cell_reset_bugdoxi2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fuvidokibet/aerospace_reports_okc.pdf
    • https://s3.amazonaws.com/zoxewudunigus/beyond_light_years_sub_indo_batch.pdf
    • https://s3.amazonaws.com/wopari/account_recovery_turbotax_form.pdf
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_d905ebc6241f4afa8fcfcc7376e885bd.pdf?index=true
    • https://s3.amazonaws.com/xajowu/business_development_intern_report.pdf
    • https://d05b2b94-0af3-401c-a6ef-75d00d0b58ae.filesusr.com/ugd/3bca44_01231beee3624d82b23c248cfbbbcbf3.pdf?index=true
    • https://e432c3f7-acc0-403b-bc7f-1b8c16782643.filesusr.com/ugd/6a4899_ff861b050f4e4ac1a50b100402b34069.pdf?index=true
    • https://s3.amazonaws.com/ribowexulo/dibujos_para_colorear_de_lol.pdf
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_218378626441466790277a92f3928d1d.pdf?index=true
    • https://s3.amazonaws.com/megujobemegor/logomesagesofepevoxis.pdf
    • http://help.walmart.com
    • 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_off0000fd47.bin
58fecde85356394a1c49f68d8542fdf5fe4e1eca540dbfea1af0225ed1528c9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD47 5428 bytes
font_01_sfnt_off00010f9f.bin
c18ec4a2c5cb3d8d6f985d348074a28760b8a1b3f2c447dcddb80451508a6f9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9F 11732 bytes

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