Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e55fcf92d0fae66…

MALICIOUS

PDF

87.3 KB Created: 2020-12-02 07:49:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a6a5cb4d6785c83440e0b2a6f9b77803 SHA-1: 97fabc4cf8f21f59f0dcab8fd61bd47ce39c028d SHA-256: 8e55fcf92d0fae669e0ab842f4c62c8e833075bc248fe53e33e3f91f8aceecc8
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-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://traffnew.ru/strik?utm_term=mastering+physics+solutions+chapter+11 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369146/normal_5f99ad0e4b124.pdfIn PDF document text
    • https://rawavofim.weebly.com/uploads/1/3/1/4/131452817/f1edfe4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448991/normal_5fb5c8b49301d.pdfIn PDF document text
    • https://xijonezamo.weebly.com/uploads/1/3/1/4/131407630/navowifepefewafo.pdfIn PDF document text
    • https://gasomuvujutomeb.weebly.com/uploads/1/3/4/3/134356107/684dc2d3a5b4.pdfIn PDF document text
    • https://zubusaxomik.weebly.com/uploads/1/3/4/8/134883199/7698588.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381320/normal_5f8b1902c1c63.pdfIn PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/92a5619077.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c1bb6ddc-48d4-4ce1-a9a7-8c345c19149b/2739878948.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40617550-53d7-4d0f-88b0-1582bdc6b8e6/kabhi_alvida_naa_kehna_full_movie_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03a0441e-f7e6-49f9-bb88-2d8e1cd36f1e/bobcat_s630_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/13953078661.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31c00b7a-072c-442e-9c59-559e373d5f19/manual_sort_pivot_table_excel_2010.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/employment_letter_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4844136c-6bc5-4ec1-a30b-08712b44ea28/fozuranojivox.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A75 5236 bytes
SHA-256: 78fb0840a90c471a7e598dfcaf34907df0cd2b1e64692b07d28b0670c47fe4d2
font_01_sfnt_off00011c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C47 11072 bytes
SHA-256: 6a5ede83294f00412e8cf79e5154b5922c4d420af2b9144fde532980ca7127fb
font_02_sfnt_off000141c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C1 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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