Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf19f7aa156bb28…

MALICIOUS

PDF

105.4 KB Created: 2021-02-21 18:47:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1bbec735c14f9188a2fc047bfbf56468 SHA-1: b3a83ec7d3dc59b1657921f884b3668a0a620d8a SHA-256: bcf19f7aa156bb282088531bd71f820bc88de73de8c5ff455fb35a1ce780b257
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified as a link farm hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malicious content. The embedded URLs suggest the primary goal is to redirect users to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?utm_term=the+constructor+function%2527s+return+type+is PDF link annotation
    • http://cheapkeys.site/robert_frost_elementary_school_mount_prospect1crlz.pdfIn PDF document text
    • https://jifofavara.weebly.com/uploads/1/3/4/6/134631997/7d5941.pdfIn PDF document text
    • https://cdn.sqhk.co/belumozobu/jjdUlCU/7858808253.pdfIn PDF document text
    • https://cdn.sqhk.co/lojenozasila/has7mic/forest_survival_guide.pdfIn PDF document text
    • https://bawidonawasaz.weebly.com/uploads/1/3/4/3/134354070/votokukaru.pdfIn PDF document text
    • https://zeraxoxuret.weebly.com/uploads/1/3/4/6/134642117/3502044.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413110/normal_5ff8617328ba7.pdfIn PDF document text
    • http://hamsterbig.com/ver_spiderman_homecoming_latino4wknb.pdfIn PDF document text
    • https://dupopawo.weebly.com/uploads/1/3/4/6/134652833/9073224.pdfIn PDF document text
    • https://suxugugufagiwa.weebly.com/uploads/1/3/4/7/134740592/3dddbabe153fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490371/normal_6011ddf8cedaa.pdfIn PDF document text
    • https://viwutexotopuj.weebly.com/uploads/1/3/4/5/134522905/6fc7f01f46f2.pdfIn PDF document text
    • https://zokefipevi.weebly.com/uploads/1/3/4/3/134311683/fuvinajipuvu.pdfIn PDF document text
    • https://lumuvimusu.weebly.com/uploads/1/3/4/7/134719948/moxizujita_mukuk.pdfIn PDF document text
    • https://wunabigoji.weebly.com/uploads/1/3/4/8/134891590/sobokefo.pdfIn PDF document text
    • http://jilet1.club/80255705557k9xsa.pdfIn PDF document text
    • https://zobojosapez.weebly.com/uploads/1/3/1/4/131483592/b983c3bcd8f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB1 2912 bytes
SHA-256: d0763fbd271711262b0a26362cc9c99fb155632731fabfacbbfc72efdb3f7c44
font_01_sfnt_off00014714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14714 4948 bytes
SHA-256: 4834179bc9f61f45f37277d7dc59b248cd6ac6a224b1bf0ecf5c3099c67310ed
font_02_sfnt_off000157fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157FA 11916 bytes
SHA-256: cf8ec2d137c2b5bcbc8226063ed27ff410f0cd414cd133430485bb8f309f6857
font_03_sfnt_off0001809d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1809D 16540 bytes
SHA-256: 035804bf5cd6abe9303b0c724d749ffea8404d4884302a48b5442f017d8594c0

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