Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d11f2ce8f75a247…

MALICIOUS

PDF

77.0 KB Created: 2021-02-15 19:14:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6fef1477b069b6d82e7460d9788b3ca6 SHA-1: 2e3be304a106a4cb78d6973767212f9f38e158d8 SHA-256: 2d11f2ce8f75a247f8a26e5da106d8f2dd9b529f4a746142442eea1f41ed7fa3
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 0.9998

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://druttle.ru/wix?keyword=organic+functional+group+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452217/normal_6009f842412d8.pdfIn PDF document text
    • https://cdn.sqhk.co/mudinaxape/6ighhrO/air_hockey_table_game.pdfIn PDF document text
    • https://kesozelakix.weebly.com/uploads/1/3/5/3/135300748/rezezolo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470679/normal_600c70fe611d9.pdfIn PDF document text
    • https://cdn.sqhk.co/xufaribo/chbhagf/magic_piano_pink_tiles_apk_mod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387581/normal_5ffd517a8def6.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/fajujiju/41682075696.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/faxogul.pdfIn PDF document text
    • http://vaxuxosubize.epizy.com/manual_bls_2017_espaol_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/caderno_de_caligrafia_para_imprimir.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/formal_dress_hire_melbourne_cbd.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/ritimiverodabego.pdfIn PDF document text
    • http://wadokeg.epizy.com/19687967807.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/alcatel_one_touch_pop_c5_firmware.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/78965820328.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_off0000ef7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7B 5460 bytes
SHA-256: 22a5cc1b498b26911a1cfa6d3b3d6676ad813bb013544efd0159a4296ca1cb79
font_01_sfnt_off00010221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10221 10868 bytes
SHA-256: 61e80d2954e955130a05c187f6e1f3fe3e955d02531f6f8146c1bf722018ed53

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