Malicious PDF — malware analysis report

Static analysis result for SHA-256 7438cb14d5506a52…

MALICIOUS

PDF

73.8 KB Created: 2021-05-22 11:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: adfae9eaf1dfd1cb75e872a3268da252 SHA-1: 3f3390f421dbeb2204aabbc55cf47fe687ae7a09 SHA-256: 7438cb14d5506a52e6803a09b88d5bbabdc5d84909c96e3fbce6a32f7409dc5d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a domain associated with malicious activity. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were extracted, the presence of a large number of external links suggests an attempt to redirect the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://resalured.ru/strik?utm_term=intellifax+2840+not+receiving+faxes PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426279/normal_60086a0538f60.pdfIn PDF document text
    • https://mebedepubini.weebly.com/uploads/1/3/0/8/130813558/6145337.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366000/normal_60542711877e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388041/normal_6011bc5ec7cd1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410965/normal_5fe3e96519653.pdfIn PDF document text
    • https://makurabun.weebly.com/uploads/1/3/4/6/134651698/wumekexefodapo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424683/normal_6035bf2d59bda.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/zazelujeju/how_much_money_can_you_make_selling_commercial_real_estate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51b0d2a0-9941-4708-b8e4-093275ba1c11/86711826726.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4100cf2-7f06-4d49-bc9e-6f63f883ff2a/how_do_you_fix_a_whirlpool_refrigerator_that_is_not_cooling.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/bootstrap_premium_templates_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/212daf15-4ee1-49f5-99f8-c31520054865/80674188772.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a8bb835-a944-4f8e-ab4c-b31e3b7cd64f/felesemanokugemeki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b94fabaa-f8a1-4843-945b-8348d83684e6/honda_pressure_washer_engine_oil_capacity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/454ba8a1-0d36-4da3-a9bf-19f384589751/86848100553.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b2acb81-8b75-4578-b387-2c92ddbf30b2/todepawijewovajevugavenuk.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/resumen_de_la_obra_buenos_dias_princesa_de_blue_jeans.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/fault_in_our_stars_book_report.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_off0000e1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E1 5668 bytes
SHA-256: 3a8589047f499d853a0963d22828c561a8d920ad0abf49b9830e268b40471573
font_01_sfnt_off0000f554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF554 10796 bytes
SHA-256: 6e68bb46db673fedfade8a7db3fd635b4e49530a6a25fa2151889145d3ad70c3

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