Malicious PDF — malware analysis report

Static analysis result for SHA-256 6195771d2c7adbd5…

MALICIOUS

PDF

71.6 KB Created: 2021-03-07 12:49:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: cf4ebb1c497db66f0dca585b85d83935 SHA-1: 993fe5786d21b1d94c56a73de5159eb8a8048936 SHA-256: 6195771d2c7adbd53d6acebdf34d0fe076dcb70f95aba759e90c1180e7112017
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with one pointing to 'leonvi.ru', suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated, but the presence of external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a pattern of directing users to potentially harmful external sites.

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://leonvi.ru/wix?keyword=the+ultimate+official+guide+to+club+penguin PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448980/normal_5fda1df95f967.pdfIn PDF document text
    • https://cdn.sqhk.co/batovafakupo/midBDvp/odyssey_atlantis_dlc_episode_3.pdfIn PDF document text
    • https://cdn.sqhk.co/nitumatemi/jdxaiZW/16620517978.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420230/normal_603cfa90d44ad.pdfIn PDF document text
    • http://fudopajir.iblogger.org/usmle_step_1_price_2020.pdfIn PDF document text
    • http://vosalax.22web.org/nosikipetowidalav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404310/normal_6024503080125.pdfIn PDF document text
    • https://cdn.sqhk.co/fodumisux/iieCtsG/39335172238.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462678/normal_60089b2e40a31.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456399/normal_5ff7cada434ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486742/normal_602247c64883b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/mafujimagapumolexe.pdfIn PDF document text
    • http://deniketeza.rf.gd/arcane_mage_dps_guide_8._1._5.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/92891124147.pdfIn PDF document text
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_91b478fb453d4ea291d49b202488ecd7.pdf?index=trueIn PDF document text
    • https://793776f3-68b4-44d3-947a-596ce2c6f652.filesusr.com/ugd/4e977a_c3e623193c0e44b38fd0b3a2772620f1.pdf?index=trueIn PDF document text
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_3888acbd6d3d4969933d965524b820af.pdf?index=trueIn PDF document text
    • http://kelopejawutan.rf.gd/76340694875.pdfIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_b564699fb28a4579b1d8abd3ef59fa2e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/islcollective_speaking_worksheets.pdfIn PDF document text
    • http://tetojijiwul.epizy.com/bible_app_that_reads_to_you_android.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_off0000dbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB8 5384 bytes
SHA-256: 7cd6c9667265b948ee721e02d7713ebc6bcbe0f0c83480aa62b10e3a26e9319f
font_01_sfnt_off0000ede2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE2 10224 bytes
SHA-256: 20197cfa752b02a795016555e5d88a6a7d88431e53d8e28fe90eede9ba444afd

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