Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a3a0b747cc41782…

MALICIOUS

PDF

112.5 KB Created: 2021-04-03 12:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7aa567669a59b647510c9b2d2233e144 SHA-1: e6ef266d804bea73d576e06698d7fe2ca107d7e7 SHA-256: 6a3a0b747cc41782d2d1f96e7b5f3f530459fab82f3356fb75357a96e18c71d8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://bologen.ru/award?keyword=what+is+conversational+implicature+pdf PDF link annotation
    • http://fivogudog.iblogger.org/44924689417.pdfIn PDF document text
    • http://salonop.xyz/q_beneficios_tiene_la_cebadash42u.pdfIn PDF document text
    • http://fridgeservice.ru/dan_brown_robert_langdon_reading_orderdztac.pdfIn PDF document text
    • http://usejus.club/describe_yourself_in_one_word_best_answeredqqa.pdfIn PDF document text
    • http://latencfsrt.space/duduvapojiwabogufebibaloletusl.pdfIn PDF document text
    • http://fixmarker.fun/asphalt_9_android_cheat_engined8czn.pdfIn PDF document text
    • http://xisumagogali.getenjoyment.net/ziwotubutipudozunufuji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb8b8cab-0f5a-418c-bd4a-4a1fef188af8/niruvam.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/gewifikararezus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b0bdc0f-028b-428d-b360-4ae1e7f559a4/brother_mfc-490cw_manual.pdfIn PDF document text
    • https://90e68d66-75cd-4f9f-aa76-03b1e6b67b4d.filesusr.com/ugd/324cd8_606ec4bfd7b64380bc0683f30b953e61.pdf?index=trueIn PDF document text
    • http://mogewatiside.epizy.com/2167508237.pdfIn PDF document text
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_f871efd813f6416892881c681f66bc46.pdf?index=trueIn PDF document text
    • http://jujageritoxo.atwebpages.com/modelo_de_excelencia_malcolm_baldrige.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00f83d13-02c9-4684-a5b3-b44c49f68fd6/good_romance_books_for_12_year_olds.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/18726696487.pdfIn PDF document text
    • http://xazomagojuwa.epizy.com/gujamopemonovokuwuj.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/63524700676.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16472 5468 bytes
SHA-256: bfe1191616e268b790ead610d36eb7559a8ade8b5d23ae23be6555fdf90f64ec
font_01_sfnt_off000176f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176F5 11688 bytes
SHA-256: 7a581ce1bb02a3197258bdd98de1a3af14342380e13c2c38040484ff0d49a73d
font_02_sfnt_off00019e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E7E 16116 bytes
SHA-256: 757edbe9ca696dc752e8794cc2fab55b744a24b197aba41abea0c8f583a0f3ca

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