Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4267d64aece0fdb…

MALICIOUS

PDF

86.3 KB Created: 2021-06-08 14:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 439f0bcf865580593afbce4ffc0b439e SHA-1: 0b0422740e872311bbb12603f7192bb4ab800721 SHA-256: e4267d64aece0fdbd21bc0f2fe335bcbb927a8f1f621f843e220a1e9d42eac67
186 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 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://coretry.ru/pbw?utm_term=revue+technique+peugeot+5008+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480579/normal_5fe6ba75cdc68.pdfIn PDF document text
    • https://numuwawi.weebly.com/uploads/1/3/2/3/132303164/5df42552d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506200/normal_5fdc92bf4c7d0.pdfIn PDF document text
    • https://dafepigog.weebly.com/uploads/1/3/4/6/134605944/0956f5196e8.pdfIn PDF document text
    • https://talidifixuj.weebly.com/uploads/1/3/5/3/135390844/4380270.pdfIn PDF document text
    • https://vasegalewi.weebly.com/uploads/1/3/4/5/134595350/wijafapo.pdfIn PDF document text
    • https://zowomotoridaxa.weebly.com/uploads/1/3/1/4/131438570/6202575.pdfIn PDF document text
    • https://fuviwezajoz.weebly.com/uploads/1/3/1/3/131379384/216028f41.pdfIn PDF document text
    • https://tufizesux.weebly.com/uploads/1/3/4/5/134596030/7814126.pdfIn PDF document text
    • https://joxobupapi.weebly.com/uploads/1/3/1/4/131454586/202932.pdfIn PDF document text
    • https://xuvodovujekezoz.weebly.com/uploads/1/3/5/9/135957716/8552469.pdfIn PDF document text
    • https://jenejipita.weebly.com/uploads/1/3/4/4/134473981/munomunajomuto.pdfIn PDF document text
    • https://tapukupe.weebly.com/uploads/1/3/4/7/134717462/7076253.pdfIn PDF document text
    • https://zawupudoj.weebly.com/uploads/1/3/4/7/134726705/1f29c2c3cb3ea4.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/139076b6-6428-4b6f-9659-53fc456de56d/las_vocales_en_ingles_con_imagenes_para_colorear.pdfIn PDF document text
    • http://molitutolu.pbworks.com/f/types_of_filling_machines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67977d41-e34d-47fa-bada-2159f475598b/can_keto_diet_work_for_vegans.pdfIn PDF document text
    • http://wiwedano.pbworks.com/f/72433586748.pdfIn PDF document text
    • http://sipibujewadu.pbworks.com/f/koletukovobujifu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/891f8e18-febe-40c5-bc3f-a75f40dc089d/91168620141.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2b10b14-5822-430c-ace4-c1c57502c698/48394310522.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_off00010c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C72 5552 bytes
SHA-256: a13a31a4eac8d15a4071a81a29e150c7a774b6fc82517bbb2afba39bbca934d4
font_01_sfnt_off00011f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F71 14076 bytes
SHA-256: cd22c1339d0eff6b29cf9f0770417548cf41a615130f1236c8e8d8204e38c4b2

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