Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c7e88bffeeee2d0…

MALICIOUS

PDF

69.8 KB Created: 2021-01-12 17:51:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 971f62930d1e3f3f8e010ee33f414d30 SHA-1: b6d0f2bc0aefb30d3e8e1ae097966c7ebda3dc05 SHA-256: 3c7e88bffeeee2d094d7c1bade737b7336759edb46fbc3954793fba639fb36f3
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagging it as a redirector and a phishing attempt. It contains numerous embedded URLs pointing to disposable hosting and a known malicious redirector, suggesting an attempt to lure users to malicious sites. The document body, though heavily obfuscated, contains metadata related to its creation, but no direct instructions or lures are discernible.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gettraff.ru/123?utm_term=murray+hill+middle+school+schedule In PDF document text
    • https://site-1174602.mozfiles.com/files/1174602/34467501780.pdfIn PDF document text
    • https://site-1176797.mozfiles.com/files/1176797/gewuzovodezejadavuk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496584/normal_5fc4ea5131144.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391921/normal_5f945b374c2ec.pdfIn PDF document text
    • https://site-1171987.mozfiles.com/files/1171987/mimidudotekaka.pdfIn PDF document text
    • https://dezekebewefe.weebly.com/uploads/1/3/4/7/134731304/fituzura.pdfIn PDF document text
    • https://zijavenokin.weebly.com/uploads/1/3/4/3/134315340/c188eb5d.pdfIn PDF document text
    • https://site-1172574.mozfiles.com/files/1172574/39304162681.pdfIn PDF document text
    • https://gujowidupisume.weebly.com/uploads/1/3/4/1/134131448/fizanonenotosil-kekevoxafore-gasira.pdfIn PDF document text
    • https://site-1176302.mozfiles.com/files/1176302/wood_carving_tools_for_sale_in_cape_town.pdfIn PDF document text
    • https://cdn.sqhk.co/gotirawuz/Knji6ia/gluten_free_birthday_cake_recipe_easy.pdfIn PDF document text
    • https://giwelexe.weebly.com/uploads/1/3/0/8/130814055/bekunetosabe.pdfIn PDF document text
    • https://site-1180889.mozfiles.com/files/1180889/2_player_game_lyrics_be_more_chill.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD534 5284 bytes
SHA-256: 56195a66e75cbf40fe395f63e08d517b0fc5c9f08ccb265c1078478bd0f915bf
font_01_sfnt_off0000e712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE712 10364 bytes
SHA-256: 0a252a85c4aa49d5a8bd98607d8a3d37b8a9a2996bcf1e945fdc53a22ae0154f

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