Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3cfb54bad4976db…

MALICIOUS

PDF

61.8 KB Created: 2020-11-13 10:41:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 8f675ffd8845a9c2f8a8e314ea42335a SHA-1: ddcd34cb53eca414dce817426ec91990daf0e69f SHA-256: c3cfb54bad4976dbe4907ab9e0cd20e4fde4eec0288c7fd9055f97aaf1366179
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=prentice+hall+biology+textbook+download PDF link annotation
    • https://rosuxemu.weebly.com/uploads/1/3/0/7/130776582/fuxubaxixazuvis_mugelo.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/fe73f04f-fa24-4e54-ad83-7b00864aa896/the_7_habits_of_highly_effective_teens_the_ultimate_teenage_success_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce1a6bdd-8f45-4663-a432-dcb3247063e9/sagowapu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25f2c815-459b-4684-95dd-732e13a4b476/pitavunuleli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0f91aaf-9b12-416c-a827-45df010ba408/33705279312.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b90bfa3f-cb98-400e-9132-6a0a758102b1/duvigefat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14857eda-360b-4b9d-8b07-9ff7b3e45fc6/download_slotomania_hack_coin_generator_v.3.6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd6c3924-7300-4352-8e72-9ebd7709c0c0/76647304047.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a7aa1ef-7a76-441f-91a5-14adfde81331/gozufux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc97cb70-6292-4b00-87b1-5b065c9b8c7f/tadulexogigetigeponis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fccabfa-5ed7-494b-ac79-8bec728dbb08/vaxosukodexoxomituvobo.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/84373864088.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/nsaa_wrestling_state_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/251033bc-6d5c-4b86-bc77-887787d93755/how_to_edit_video_on_apple_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6074275d-6498-443a-a531-df8621cf3b6e/67371461480.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_off0000b3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C2 5492 bytes
SHA-256: da2fed2e467681a32118e6246aed62e6fd1aa96635565d4805b54bfd6e0ba609
font_01_sfnt_off0000c683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC683 10708 bytes
SHA-256: 4602c11c79bbc45340078522066489641aeb9e066fc45b2a812539795a7fbfd2

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