Malicious PDF — malware analysis report

Static analysis result for SHA-256 289a8cb5ab2d23a1…

MALICIOUS

PDF

75.6 KB Created: 2021-03-12 10:18:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 72195194d2b84e730d1cd6dd01c2b420 SHA-1: eb2e1abdc7b91175f2d827eb8323c160473c647c SHA-256: 289a8cb5ab2d23a1e2f14380bc549b40a959fc9a209842f6bf2c741567ded109
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. It contains numerous embedded URLs, with a primary focus on 'https://kuzutuzo.ru/award?keyword=the+bluffer+s+guide+to+etiquette+pdf+download', suggesting a phishing or malware distribution lure. The PDF also functions as a link farm on disposable hosting, further supporting its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/award?keyword=the+bluffer+s+guide+to+etiquette+pdf+download PDF link annotation
    • http://zemimumaloger.iblogger.org/dusonijugelojitularonu.pdfIn PDF document text
    • http://presalon.xyz/octavia_butler_wild_seed_quotesuhpgy.pdfIn PDF document text
    • http://xazivigufimu.22web.org/family_business_case_study.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411001/normal_5fd28538d3866.pdfIn PDF document text
    • http://rezumitisud.mygamesonline.org/souad_brule_vive.pdfIn PDF document text
    • http://natotakujoriw.iblogger.org/does_edward_die_in_twilight_new_moon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408195/normal_601fd432884f0.pdfIn PDF document text
    • http://tiktokhd.design/vegunaattsk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421201/normal_604b1ba81a8c0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zijedan.atwebpages.com/the_tempest_with_line_numbers.pdfIn PDF document text
    • http://xawavejemefo.epizy.com/makeup_artist_logo_vector_free.pdfIn PDF document text
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_54343c0aefb54ab8864aec10545f5cef.pdf?index=trueIn PDF document text
    • http://kegepedefaripi.epizy.com/lezek.pdfIn PDF document text
    • https://6c473ef0-402e-45f0-9f95-6bc7e89a6a1a.filesusr.com/ugd/5518c3_6306a6961a394ff09cb9d2a2cd16ca36.pdf?index=trueIn PDF document text
    • https://e4586023-485a-43f1-9451-2d404684c5b7.filesusr.com/ugd/95ff22_27ea93580956413c88ccc5e231f9f78b.pdf?index=trueIn PDF document text
    • http://wowimes.epizy.com/buzolunel.pdfIn PDF document text
    • http://ligoroxenafof.atwebpages.com/25280592483.pdfIn PDF document text
    • http://kemesuxaw.myartsonline.com/25723505354.pdfIn PDF document text
    • http://nisugaraxefubo.rf.gd/39948827304.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_off0000ead5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD5 5612 bytes
SHA-256: 51ce89863f1c0180889bee9450601f18c6794c7327f1b710814fdc0d556fac05
font_01_sfnt_off0000fde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE3 10428 bytes
SHA-256: 88196dd350aec32a10a85a96b296c897580c5cd60b9cb06565091616afab2112

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