Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e326f1a83eabcec…

MALICIOUS

PDF

63.8 KB Created: 2021-01-09 23:16:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e5e88d1c6741f68eb2f211f319b61a8d SHA-1: 4d38c4b8a5cd5b11762ee60ce7124bb422e1366b SHA-256: 0e326f1a83eabcec251637ecc7564a91095cd7eca5495bcedd31c90118004c38
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a malicious redirector. The heuristic firings indicate the document is designed as a link farm, likely to distribute malware or phish for credentials. Although no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence suggest a malicious intent to redirect users to harmful content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=the+enduring+vision+8th+edition+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4427293/normal_5fb2cec02c7b4.pdfIn PDF document text
    • https://site-1209466.mozfiles.com/files/1209466/remuzosenapu.pdfIn PDF document text
    • https://site-1166687.mozfiles.com/files/1166687/jalumozeruxitedusegokafax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370740/normal_5fe1b854d4198.pdfIn PDF document text
    • https://site-1174122.mozfiles.com/files/1174122/ford_mustang_super_snake_2019_price.pdfIn PDF document text
    • https://site-1166652.mozfiles.com/files/1166652/kiwumanirexukogegilepew.pdfIn PDF document text
    • https://site-1175077.mozfiles.com/files/1175077/garden_word_search_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380392/normal_5f9e647fb82cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425235/normal_5fe5466b9ede3.pdfIn PDF document text
    • https://site-1172540.mozfiles.com/files/1172540/refipumakapukazedud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460076/normal_5fe7479f53869.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/luborinizu/2096125120.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/aman_dhattarwal_chemistry_notes_download_class_12.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/camry_2012_owners_manual.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_off0000be33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE33 5264 bytes
SHA-256: bcbe5d3ddec9ee935c1ca33fe4bbbfc6d5049939d6f1a982c9f3bf23b8cae5c3
font_01_sfnt_off0000d022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD022 10020 bytes
SHA-256: dc4cdd5d64387e83eaa804bc97ebeabf4009d08f74ef1f01d4a68339d0886b15

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