Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4bde8cabcc0922d…

MALICIOUS

PDF

70.7 KB Created: 2020-11-24 00:09:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7439cfc933de71b141ec1cd7da51bc51 SHA-1: 179f9e9fd7a3755a0e4f7aaa5ef8762c7362d857 SHA-256: b4bde8cabcc0922d222249c4d8d357cc12dd393e8066bbfffb5d459183e3d5cc
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, with the primary URL being trafficked for potential phishing or malware delivery. No scripts were extracted, but the structure suggests a lure document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/strik?utm_term=cooking+oil+comparison+chart PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368497/normal_5f98c9b87a7a7.pdfIn PDF document text
    • https://tuzuwopibas.weebly.com/uploads/1/3/4/3/134316447/tekixoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408875/normal_5fa9647cd9c29.pdfIn PDF document text
    • https://bupigesow.weebly.com/uploads/1/3/4/3/134360728/zaludarizagit_guwesekafizuvax_fefakojax_pubafexem.pdfIn PDF document text
    • https://riwurarelix.weebly.com/uploads/1/3/4/4/134484082/7724025.pdfIn PDF document text
    • https://zuvubexusemeto.weebly.com/uploads/1/3/4/3/134373725/popijipuni.pdfIn PDF document text
    • https://sexozorojupur.weebly.com/uploads/1/3/4/3/134390270/zufoxo-setiwekusovozup-dawutifexofoli-nofafefedudeza.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/5a54332d-c802-4a2c-a7b9-085896f4c3d0/fikikixafix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b5cd0de-826f-42ff-9a12-c8df5d81880e/40507996414.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cd80ca7-3631-465a-8a9c-13aa056f3db5/macbeth_act_2_modern_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35373ee2-bb0d-4779-a48b-8973eba22429/warhammer_books.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/wei_wuxian_age.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f97af91-cacf-4938-b997-63e9d5285f8f/1mobile_market_apk_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cf8eb60-2207-48c2-80b2-3efa24ea52b1/wavisegi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1ae5697-146c-42f4-afad-309739adea71/bimsa_reports_2016.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_off0000d93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93A 5316 bytes
SHA-256: 65a7f067c263d298357e81024a2eee0a8db0928653f9709687fd7c4c629309f0
font_01_sfnt_off0000eb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB23 10348 bytes
SHA-256: 1dea2407f58633c1f7b3b92a7faafc1146c128f67df175d9c651df8e10113a93

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