Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8b67e2d09b588c…

MALICIOUS

PDF

70.4 KB Created: 2021-03-24 00:02:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f00b9efbcae3e3cc8e57b588f7150749 SHA-1: aa8cd025e623ef9c7285a16fd25642f378c0ea6b SHA-256: 4e8b67e2d09b588cc7bb346449b64517db1889e19a4086099ec2818b12dccab6
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://resalured.ru/wix?keyword=glittering+generalities+propaganda+ww1 PDF link annotation
    • https://varusimutajol.weebly.com/uploads/1/3/4/5/134502614/4c56884aca36e.pdfIn PDF document text
    • http://feremujidonigu.getenjoyment.net/22419623554.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/uwii7OL/minecraft_pocket_edition_lite_free.pdfIn PDF document text
    • https://cdn.sqhk.co/rilowikapaz/yJibjfz/evil_nun_scary_horror_game_adventure.pdfIn PDF document text
    • https://tupirusu.weebly.com/uploads/1/3/4/7/134702138/841592.pdfIn PDF document text
    • https://cdn.sqhk.co/nivavepe/iajbrgd/95841982327.pdfIn PDF document text
    • https://tiwudusakuwizir.weebly.com/uploads/1/3/1/6/131637104/folagolapeporalusu.pdfIn PDF document text
    • http://tinutig.22web.org/unir_dos_en_una_hoja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://filevixe.rf.gd/lodaw.pdfIn PDF document text
    • http://rujidafedisezu.atwebpages.com/which_roomba_has_the_best_suction.pdfIn PDF document text
    • https://627ea4a7-3f28-4bf3-8c99-6a9da7dacf48.filesusr.com/ugd/1970e2_fa7d557fc5664accb54d764d1155fa7d.pdf?index=trueIn PDF document text
    • http://sajoveguduv.onlinewebshop.net/padma_awards_2020_list_in_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9de23f9-1cb2-4fef-929f-da1af859d9b0/what_flowers_grow_best_in_central_florida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acf87529-d32d-4bb8-915e-b6e60c897a8d/xufafirenariwejufaribuf.pdfIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_a9207db3a5544ffd990ec6c9f627d97b.pdf?index=trueIn PDF document text
    • http://bosadubarelazu.rf.gd/26961963094.pdfIn PDF document text
    • https://404c0e03-56c4-4888-bb84-d9d32a71a3e4.filesusr.com/ugd/100e2e_e5b32dc8af97497d8b224ad9f26af166.pdf?index=trueIn 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_off0000d480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD480 5300 bytes
SHA-256: c5cdb96946afe7995e1afffe24252ab417229d89d50d06f3582ad87020176f81
font_01_sfnt_off0000e6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AE 10884 bytes
SHA-256: b4b49fbf35e48727d4b82dc071cccf61cf15331322b66dc6c275cf740a2fbfda

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