Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a1cd96a2b0accd…

MALICIOUS

PDF

70.9 KB Created: 2020-11-20 06:54:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 65f9d33424abdf702d12601f462dbd55 SHA-1: 13101d1401d011912921329191930d484ec92452 SHA-256: c4a1cd96a2b0accdb2e2cb43a9515d20f5637ef31c03269c1ac1ee3a95898077
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 0.9997

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 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://traffking.ru/strik?utm_term=minecraft+samgladiator+yandere+high+school+ep+1 PDF link annotation
    • https://rurizurerenudiw.weebly.com/uploads/1/3/4/6/134649160/581283.pdfIn PDF document text
    • https://dafebifu.weebly.com/uploads/1/3/4/3/134399244/fumularipik_tuvunuxofofab_nibidana_xosarujoparuto.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/b02880cc-381d-4af2-b329-41bcf086afd6/advanced_rapid_keto_burn_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/brazilian_blowout_formaldehyde_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/848a9afe-b460-4ccf-9db4-1b1ddea93eb3/xevokufigakaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab383762-1be1-4656-bed3-f470deee44f9/30134979852.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/118378eb-c4de-4d70-8e93-5d2a35a26ecc/muestreo_irrestricto_aleatorio.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/who_is_the_father_of_sociology_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/rekibedafowow/banjercito_ciudad_juarez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/218050eb-9a24-43b1-beec-6a872e41a106/adobe_illustrator_download_cracked_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/998d71df-38fd-45b2-a4ea-a01b48bf7c7b/words_with_zad.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/zirevokodijavozisejixuki.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_off0000d45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45E 5728 bytes
SHA-256: 3ea7ab57f1bddacf02ed8b010e99eeafeb1370893993bd4349ba87e3b5a13d6e
font_01_sfnt_off0000e7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CB 10884 bytes
SHA-256: 8909b591242a66386e5764f8c88ef7b56045656f7377b64bd55f7de03e10107a

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