Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dbdd8d3f05a96bf…

MALICIOUS

PDF

67.2 KB Created: 2020-11-19 20:49:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a6a661d9765df4dc7ddf6dcbd77151f9 SHA-1: 16d346afc34116fc14ed670195a3c5571aac9982 SHA-256: 5dbdd8d3f05a96bf6039fd66f518aefda7671df6b098fe75d841224631eae09b
156 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 5

  • 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.
  • 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/strik?utm_term=asp.+net+core+interview+questions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378152/normal_5f9f03a041c3b.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/7886032.pdfIn PDF document text
    • https://sixapinipuso.weebly.com/uploads/1/3/1/3/131384402/lifadelalasuga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382631/normal_5f91f40f3c51c.pdfIn PDF document text
    • https://jopixumux.weebly.com/uploads/1/3/4/7/134734794/lefixorolukoje-mutoto-kumorovexuxobaz-guxulixujeji.pdfIn PDF document text
    • https://ziwegakesamud.weebly.com/uploads/1/3/4/4/134468237/burijupuvukoporezo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f8724817ceaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366022/normal_5f9256cc1e548.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450247/normal_5f9e911f84746.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422148/normal_5fa3c587b1d9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410962/normal_5fad720e8c61a.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/a4531017-82a0-44e5-b95c-dbcbde978249/3946743050.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4de23030-5dda-428c-9f46-3d8bbc1c80eb/44769410709.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73e1f678-052a-47b1-a39a-a1f9edfc63fe/dobovazutajopejazuxuve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09ce893b-618d-4297-acce-75218a0b0e32/doraemon_the_movie_2017_great_adventure_in_the_antarctic_kachi_kochi_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_off0000cb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4C 4984 bytes
SHA-256: 0f43fb730322e5ff46c15142d8ab06e376587bf1eb0e02bd66250971d876fb99
font_01_sfnt_off0000dc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC74 10564 bytes
SHA-256: f2599b98f1deee2d4879e35d9787dd6e1c8becee7fb4566680d8aa5eab15cbca

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