Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd6ebbd6d8d3e986…

MALICIOUS

PDF

75.2 KB Created: 2021-03-09 21:44:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b42e606dcd3a5db7c90dfcfba8940ec2 SHA-1: 3328f6fe400c2db066870b8d059f0629e1465e6a SHA-256: cd6ebbd6d8d3e986cf4a66c030ebe416b17483a5e0c63e2d8e4712d546fcee50
126 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to disposable domains, many of which are structured as link farms. The document body, though heavily obfuscated, contains references to game cheats and software product keys, suggesting a lure to trick users into visiting these malicious sites. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/aws?utm_term=gran+turismo+6+cheat+ps3 PDF link annotation
    • http://woxuruko.medianewsonline.com/letasoft_sound_booster_product_key.pdfIn PDF document text
    • http://tramlaweq.online/189055873359t6ts.pdfIn PDF document text
    • http://shopyou.online/9994218127153h2w.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496607/normal_5ffacc397d28e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443608/normal_5febfa9deb6c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379384/normal_5ff659da4812b.pdfIn PDF document text
    • http://ludshop.xyz/solving_and_graphing_compound_inequalities_worksheet_answersclqe5.pdfIn PDF document text
    • http://daravto18.ru/bikupuczzgq.pdfIn PDF document text
    • http://alcozerox.com/algebraic_equation_worksheets_7th_gradera98y.pdfIn PDF document text
    • http://solusaxisabo.scienceontheweb.net/jumperoo_fisher_price_rainforest.pdfIn PDF document text
    • http://reduslimitaly-official.site/32715147876tqiky.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413697/normal_60388ca6d96cd.pdfIn PDF document text
    • http://sabovibin.medianewsonline.com/how_to_write_a_good_personal_story.pdfIn PDF document text
    • http://femetorisufi.sportsontheweb.net/how_long_does_it_take_to_cook_a_20_pound_turkey_in_a_convection_oven.pdfIn PDF document text
    • http://nickned.me/chrome_ig_story_alec_garcia_download4vajq.pdfIn PDF document text
    • http://ryursew.space/leveling_guide_for_ffxivd2omy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://filosoko.onlinewebshop.net/pifemiris.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/hayward_sp1592_power_flo_matrix_1_hp.pdfIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/xovemesuzevipewe.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/carl_zeiss_meditec_ag_email_format.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_off0000e817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE817 5488 bytes
SHA-256: b4a9967ad51a18cd475b70ad7c98e6b65bf4fb0aa46bbdf72f05b5504fd5b878
font_01_sfnt_off0000fa95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA95 11068 bytes
SHA-256: 16b165510c4d057338cea6d4020420b984d6c151114cd3f1786bed06e60b633d

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