Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1c1fb26137a390…

MALICIOUS

PDF

74.7 KB Created: 2021-04-01 04:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e23d4d691c634061e80febb5e5af160a SHA-1: ddf49c65e3ba19e9d061addc6ef70b373186337f SHA-256: 4e1c1fb26137a390fa0376484c9c0b3f9891ed9e4376b5b6be89e9ec70e66e31
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded links that redirect to known malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, suggests a lure related to financial software ('quickbooks'), and the overall structure points to a link farm designed to distribute malware. The ML classifier and ClamAV detection further support its malicious nature, likely involving exploitation of PDF vulnerabilities to redirect the user.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=how+to+post+a+journal+in+quickbooks In PDF document text
    • http://tozofuji.scienceontheweb.net/69819124229.pdfIn PDF document text
    • https://napolapivu.weebly.com/uploads/1/3/5/3/135303388/lunudaripu.pdfIn PDF document text
    • http://suporefebakibur.mygamesonline.org/lead_lag_compensator_design_using_root_locus_plots.pdfIn PDF document text
    • http://dutarotanazosuv.medianewsonline.com/85287133689.pdfIn PDF document text
    • https://cdn.sqhk.co/silutoge/YDTzIIa/desidomesijizibo.pdfIn PDF document text
    • http://jesofoma.getenjoyment.net/gileloriro.pdfIn PDF document text
    • http://dmdmassage.com/dbs_ideal_login_guide1avmr.pdfIn PDF document text
    • http://shothard.site/logitech_k360_stopped_workingjwr6s.pdfIn PDF document text
    • http://rijewomel.scienceontheweb.net/karl_marx_le_18_brumaire_de_louis_bonaparte.pdfIn PDF document text
    • https://samabuwe.weebly.com/uploads/1/3/0/7/130739499/fujadowejolov_kisebanapufuf.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/razuxuxogamabaxovap.pdfIn PDF document text
    • http://tokudujadi.medianewsonline.com/perc_h700_integrated_firmware.pdfIn PDF document text
    • http://winoorama.space/thai_lottery_results_chartkalyz.pdfIn PDF document text
    • https://sojagimizalafar.weebly.com/uploads/1/3/5/3/135317111/9783469.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/f2ghx7x/21970722236.pdfIn PDF document text
    • https://cdn.sqhk.co/korebuxaguz/ifjhXhd/nunelojuzowuxolu.pdfIn PDF document text
    • https://pawizujepus.weebly.com/uploads/1/3/1/6/131637171/4500298.pdfIn PDF document text
    • https://pemolopudamas.weebly.com/uploads/1/3/4/7/134753943/3397128.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tirisesu.onlinewebshop.net/beehive_textbook_in_english_class_9_download.pdfIn PDF document text
    • http://fataragoreb.myartsonline.com/bjt_transistor_analysis.pdfIn PDF document text
    • http://rogomore.myartsonline.com/58706199715.pdfIn PDF document text
    • http://dugerem.atwebpages.com/agriculture_business_management.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE694 5384 bytes
SHA-256: 90cc0570a1ebf67f069d4e30122dc5f371a6715397c6ef64f8d18367a6af96e8
font_01_sfnt_off0000f909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF909 10636 bytes
SHA-256: 280941e8a9ba9b2ff345052312e85cfe0c689d7fe8c66042bf1418e95fa0302b

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