Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a28f6a301a633c…

MALICIOUS

PDF

118.1 KB Created: 2021-03-20 14:27:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f55fa77a25291f5ee0765f4801435ccc SHA-1: 702229f5027df8546a9017257902cf3e781f5abf SHA-256: 77a28f6a301a633c2b10318619e7c35f4341631f7546ab1ca5410cc9ed2c450c
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to suspicious domains, suggesting it's designed to redirect users to phishing or malware-hosting sites. The PDF structure and the presence of external URIs, combined with the 'link farm' heuristic, strongly suggest a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/strik?utm_term=what+is+the+critical+value+of+90+confidence+interval
    • http://pochta-24.cc/grade_1_maths_worksheets_south_africarzqat.pdf
    • http://nesobaka7.xyz/university_physics_volume_2_answersl2yxf.pdf
    • http://potolkilife.ru/brain_teaser_worksheets_for_middle_school91un5.pdf
    • http://probnik1313.tech/vajiderokebodowoxizotupfr2o0.pdf
    • http://groshyk.site/lafenafuzenibotiz8l84j.pdf
    • http://carbackseat.site/71755988237jdoex.pdf
    • http://lazadacostumercenter.com/55778960658p6nr0.pdf
    • http://bcpzonasegura10beta-viabcp.com/xinigisiluwiponukolap7m3sf.pdf
    • http://musc-media.xyz/international_business_machines_corp_stock_pricepcdzv.pdf
    • http://geosen.net/29504796728ssj11.pdf
    • http://hookup753.fun/58525037821v6e8y.pdf
    • http://chtotakoeverti.biz/andrew_jackson_political_cartoons_indian_removalfwxy2.pdf
    • http://karnaval.host/canoscan_lide_220_driver_free_downloadav9na.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_561a23e30a8c48598b070f8bd6e926ae.pdf?index=true
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_a392a405e2b14d23aeabffef63b96831.pdf?index=true
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_909d89f276e34a7bb0f07658bbb3bafb.pdf?index=true
    • https://b3159766-6c8b-4733-a97d-e59ef6783693.filesusr.com/ugd/21851e_a80a3f12c14840ec8bcb5f448545acad.pdf?index=true
    • https://aece7fbc-7072-4055-9cfa-29e0da41b620.filesusr.com/ugd/e878fd_5172a2e9dec04b079db6e534d3ea7cfa.pdf?index=true
    • https://s3.amazonaws.com/zerepuzuze/craftsman_25cc_gas_blower.pdf
    • https://s3.amazonaws.com/dutimajizowa/94125903326.pdf
    • https://s3.amazonaws.com/rikolesafuwofar/what_is_a_product_manager_salary.pdf
    • https://s3.amazonaws.com/mokixetat/7062521368.pdf
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_0ff0d7e290504a149c53ee9fc39bad1f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017fe0.bin
4b63ca87f45cd540cae442134f377780389a03d5f9126bfcff06729f747a0500		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17FE0 5364 bytes
font_01_sfnt_off0001921d.bin
db02a406e2e78acb39c256968b546670b05e38cc159d5d26e4a7ba56424413d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1921D 12296 bytes
font_02_sfnt_off0001bbcd.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBCD 4324 bytes

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