Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc7dbb984977071…

MALICIOUS

PDF

87.0 KB Created: 2020-11-14 15:47:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f4fb7feb34a3dd925e7db1695d4a6342 SHA-1: d97aab6520d0b79365d30b8f8266a9da1687f27c SHA-256: 8bc7dbb984977071dea3cf6fa89a10d80e09c2b73f9f766e3c667f81801b17ee
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 0.9998

Heuristics 6

  • 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.
  • 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://traffine.ru/123?utm_term=qooapp+apk+pc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455197/normal_5fa51d837ad06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388833/normal_5f90ea0c1324b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368467/normal_5fabc02b6c404.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366973/normal_5fa709632cec2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371787/normal_5f905db77e69f.pdfIn PDF document text
    • https://mivubifazexaj.weebly.com/uploads/1/3/4/3/134381565/7407827.pdfIn PDF document text
    • https://wuwuleli.weebly.com/uploads/1/3/1/3/131398564/poxekuzolaperapov.pdfIn PDF document text
    • https://wesemijotabiwa.weebly.com/uploads/1/3/4/6/134622043/bd88fc89e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367294/normal_5f8b427b17767.pdfIn PDF document text
    • https://zutafemaz.weebly.com/uploads/1/3/4/4/134478566/313dd4f.pdfIn PDF document text
    • https://sifasoralut.weebly.com/uploads/1/3/4/4/134488674/pixejezoput_lavivuke_duniduzeva_kopexejosevabi.pdfIn PDF document text
    • https://nunamazo.weebly.com/uploads/1/3/4/3/134311680/rufutamilalozegifek.pdfIn PDF document text
    • https://luvupomadimudux.weebly.com/uploads/1/3/4/3/134350134/b3fcdd838dc07.pdfIn PDF document text
    • https://tilawebaxipas.weebly.com/uploads/1/3/4/5/134576196/5df78230ec9.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/2c5d7994-3bc3-41c2-9b61-fed1f4f66a70/watch_fringe_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9833fab5-b17d-4d08-838c-1f081e726b49/gegafudevunow.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_off000117c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C6 4748 bytes
SHA-256: 45d89d8aea56183824bfa2485b5cedaca2574d1a4553d1c6fe8b893772dfeea7
font_01_sfnt_off00012804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12804 10924 bytes
SHA-256: 25e0b6440c7d494bf93eb275760bcfca37c856de4e79637e3c548f66c5825e09

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