Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3aaa26a3a89ce1…

MALICIOUS

PDF

103.8 KB Created: 2021-05-31 09:41:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2ac8fe8b5d92cb1a9e20362e17080ce4 SHA-1: d875efdb6013ea5a44887c8c2d75e97cbf0f2fd8 SHA-256: 5b3aaa26a3a89ce1822320d487dbfe37823824c9f76033b3f0fdc00cf4fe40fc
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://seumenha.ru/123?utm_term=beverly+hills+90210+episode+guide+season+6 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471958/normal_60431301f190d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495399/normal_5fc6d74c6b6f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495685/normal_5fcc21355431a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405662/normal_5fc6cbb0bcf8a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445877/normal_5fdfaaca2ab54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416810/normal_5ffe88b037a12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455902/normal_5fd7f7e3a6e15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485163/normal_6020638a74968.pdfIn PDF document text
    • https://nidixinaxob.weebly.com/uploads/1/3/0/7/130739699/8839427.pdfIn PDF document text
    • https://bafuzonexive.weebly.com/uploads/1/3/0/7/130739369/baxudo.pdfIn PDF document text
    • https://loneluripovulom.weebly.com/uploads/1/3/4/3/134364014/jobup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4526930/normal_6040fb6ae4ee2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413368/normal_601cbc7d3d3a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389823/normal_603a9350ac71b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404297/normal_602662cd68c78.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/0c384a13-0e0a-45c0-a43d-81eb1b5a9cc9/computer_case_fans_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e33bc4d5-8255-450b-8290-6ec38e3393c8/is_reading_the_game_of_thrones_books_worth_it.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c80d8182-4847-4634-9501-481e991af283/wijolinomuzasesemimiwen.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_off0001557a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1557A 6068 bytes
SHA-256: 4d3ecca3d3349d99e8f71ec321b5a32e979137688ebc91d2a467d485348fa897
font_01_sfnt_off00016a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A21 11640 bytes
SHA-256: 4d3ae9c389f6cbff3dde20c2abfb8ed1e3588a53c0d72de6fbf7ef8c9a4eb149

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