Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4443d45e83a714e…

MALICIOUS

PDF

74.9 KB Created: 2020-11-17 05:17:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b071e6f72a1121aa5a004773935d1db8 SHA-1: 1d71a71e93a25c3df1b97d0bb68b48e116e42f92 SHA-256: f4443d45e83a714e49ecae9c2a99d52a26e4d1753972b6c3f7d7ecb312a6c48e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9996

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 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://trafftec.ru/123?utm_term=how+many+ml+in+a+standard+glass+of+wine PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417426/normal_5f9fc07b6ff08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454436/normal_5fac63084d4ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367905/normal_5f8765682188f.pdfIn PDF document text
    • https://sujexixapobitu.weebly.com/uploads/1/3/4/3/134328704/f4db731d63.pdfIn PDF document text
    • https://duxebiforup.weebly.com/uploads/1/3/4/0/134013009/2261418.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403816/normal_5fab63a628e06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417413/normal_5f97d65888235.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366339/normal_5f8ce3e5efe1c.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/kelukakeb/bikejabunibafopawumej.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/paneru.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/barking_to_the_choir_the_power_of_radical_kinship.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/the_real_act_prep_guide_3rd_edition_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/stain_glass_tables.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C1 5384 bytes
SHA-256: 79d0b74490901050c147010c7a5656a822146f345eb537f8258898c2d3523106
font_01_sfnt_off0000db03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB03 2192 bytes
SHA-256: 562fe3332d4253f0f778e00c8f688d9225fe3e50f5082ff0eef712c2d4c2c124
font_02_sfnt_off0000e513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE513 9972 bytes
SHA-256: 020d20dde81d2ee742ff9d3e56cfab31fe612ec06339a4bdf666bca06411f5fa
font_03_sfnt_off00010742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10742 16616 bytes
SHA-256: ccb2d685929782112b627887fc92287953b711da5910fe1c390e3e1efc715c20

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