Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b55bb133acd173…

MALICIOUS

PDF

70.2 KB Created: 2021-06-11 04:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6cb2a02b6ccc786f0420e233101cc798 SHA-1: e1ad7978105b698005dd196f00f0a7159ce6e1bc SHA-256: d8b55bb133acd1733e02053715a20d0a47556e36b55f1e2f479fe6601676bdec
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, including a prominent one to 'chcial.ru', disguised under the guise of a YouTube guided meditation. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting a link farm or phishing operation. ClamAV detection and ML classification confirm the malicious nature of the file, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/pbw?utm_term=youtube+guided+meditation+for+anxiety+and+stress PDF link annotation
    • https://voduvavib.weebly.com/uploads/1/3/4/0/134096125/60f2c0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366664/normal_60bad9c48f2f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369498/normal_6041627f8b0ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473971/normal_605715d7b72a6.pdfIn PDF document text
    • https://jugozufenuw.weebly.com/uploads/1/3/4/2/134266135/natame_xukirulekasevo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387922/normal_5fd76bc229ed9.pdfIn PDF document text
    • https://fezinonod.weebly.com/uploads/1/3/1/0/131070080/7360593.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455390/normal_5ff7731c391dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488339/normal_60571de56458d.pdfIn PDF document text
    • https://vedakevuvapi.weebly.com/uploads/1/3/4/0/134013486/4377233.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/ae27ad5f-2963-45c6-be5c-36f89f7bdfd4/nufigajuku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be9b5a21-e173-4984-8e60-88f08e56f21c/55177842221.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf0bd26f-6cc1-4ee6-9965-4092a9aed87f/what_is_the_book_gone_about.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03241ee0-361a-4920-a612-7bbce00d7930/rabupo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfdfb8d6-de23-4bcb-8420-e264a94f11d8/29847129086.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/622101e5-07b1-4e4b-8e65-b5b01218d277/82720716881.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92143b55-3c09-4af1-9dc2-b06b88e343b9/87246296307.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39f1bbb3-055c-4885-8534-75b3eb83dfb0/zukelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff65570c-abb7-48f8-9163-93a34329dab9/16518270797.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_off0000d7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A3 5468 bytes
SHA-256: ee29c016ff8a2075696b45b886b8acb7c07237298aadc6291d37bf014d1d1759
font_01_sfnt_off0000ea2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2E 9636 bytes
SHA-256: 3fa2c845dd4d6844332ae3b46b6071313aca2403292fae70ac5a216738ed687a

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