Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d013773cf9c9d6…

MALICIOUS

PDF

63.3 KB Created: 2020-11-11 00:43:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0278dd8396179a5d77ac22b16f17cdb3 SHA-1: 14a0288ff54db477507304e3dd68d73ec73ae14e SHA-256: f3d013773cf9c9d6cdee593f153e8aa85b117565936d9a9d1786b38de5a8091e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/123?keyword=author+s+purpose+activity+2+answer+key+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382961/normal_5f8cf61f5adff.pdfIn PDF document text
    • https://vusesuke.weebly.com/uploads/1/3/4/7/134723580/veluxijaforedelekuxa.pdfIn PDF document text
    • https://dilenobepaw.weebly.com/uploads/1/3/4/6/134662491/7d0fcd1a6290.pdfIn PDF document text
    • https://mirivibi.weebly.com/uploads/1/3/4/2/134234555/960699.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/b906042490.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420602/normal_5f97ceab536b6.pdfIn PDF document text
    • https://ponixojezunuto.weebly.com/uploads/1/3/0/9/130969897/xewotubagi.pdfIn PDF document text
    • https://pozebukewif.weebly.com/uploads/1/3/4/3/134330137/bc9380dda.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/bc371217-86ec-4190-8481-24fa2133d450/kiliximevive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a477bd50-b610-4002-bc8a-8f69cd00a58e/16391393251.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9de00b01-d25f-4d9a-912e-fa313a963c8a/rirenalutabavedos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50a649de-0d20-48bb-9ed8-72cc6a6e6489/29658478330.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf62b847-08bc-47da-8624-2641f3ee3faa/fe_other_disciplines_review_manual_lindeburg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95f1e086-5e05-40f5-8a82-d5eedccaf183/apk_store_download.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_off0000b9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9BE 5648 bytes
SHA-256: b410ca68ca524a08b6b6a351370b9eff25acd2f675b6780f3a67ddde44ab9e7d
font_01_sfnt_off0000cd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0F 10272 bytes
SHA-256: 242c01c6ea4d73f4e4d1badba7529cef179aafbf645af1d7c886a4f3b1436a70

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