Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d3b1bb542f9cfb…

MALICIOUS

PDF

79.9 KB Created: 2021-04-13 14:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d7bd71d7dd260bb0e93044f82e1e830 SHA-1: bca2efe68b9e213049a1cd9999b822ad7abe7c06 SHA-256: 16d3b1bb542f9cfb8112ddd8762c9e9ed9d3738a25b8bfc1bbedf1f20f4b3c79
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or redirection scheme. The presence of 'utm_term' in one URL further supports a campaign-like structure designed to track user engagement with lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://seumenha.ru/strik?utm_term=proform+1350+exercise+bike+tour+de+france
    • http://kirakexig.mypressonline.com/duwirorugenakofe.pdf
    • https://cdn.sqhk.co/bezakebijuk/Uhgb9jb/80513329083.pdf
    • https://cdn-cms.f-static.net/uploads/4387419/normal_601cfce3e33e5.pdf
    • http://sozapemogoz.mygamesonline.org/wozig.pdf
    • https://static.s123-cdn-static.com/uploads/4368969/normal_5fc882d3eeaa9.pdf
    • https://cdn.sqhk.co/letareximo/fjehdj0/78443447435.pdf
    • http://xofazonir.iblogger.org/2016_idsa_pneumonia_guidelines.pdf
    • https://cdn-cms.f-static.net/uploads/4386613/normal_6066d043c9bac.pdf
    • http://boforobevuziko.mywebcommunity.org/14324869173.pdf
    • https://cdn.sqhk.co/narulaloro/kmDfhc3/pacdude_games_countdown.pdf
    • https://static.s123-cdn-static.com/uploads/4459062/normal_5ffdd7467720c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jopavufugas.epizy.com/football_offensive_stats_sheet.pdf
    • http://mogerokefo.epizy.com/how_to_connect_my_sony_tv_to_bluetooth_speaker.pdf
    • http://gatakokuto.rf.gd/85441742795.pdf
    • http://gatafowe.epizy.com/yamaha_motif_xf8_price_in_ghana.pdf
    • http://dajizipazubeva.epizy.com/banyan_tree_pic.pdf
    • https://2c91b947-1dd8-401e-ae91-d595f2f75867.filesusr.com/ugd/0af078_17dd4c467ddb4031981b78a695f79d55.pdf?index=true
    • http://sabixukavizom.myartsonline.com/all_color_code_in_html.pdf
    • http://dezizogumeb.epizy.com/how_much_is_a_401k_match.pdf
    • http://bujekotu.atwebpages.com/1703313812.pdf
    • http://guminol.epizy.com/lakas_atenista.pdf
    • https://dfdccaec-9019-42eb-ab8c-14eed22d5f88.filesusr.com/ugd/2e00cc_5d4216ae100e4fa682ad1c3a31df4503.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_off0000f7dd.bin
4bbe54afc327166e0a52e23d651f978e2881d3837d4667e72caa469c161df8a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DD 5892 bytes
font_01_sfnt_off00010bde.bin
62196b91f598570e336c97525db4929bfe8a1abab4ad4893fd296c8e503d1815		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDE 10788 bytes

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