Malicious PDF — malware analysis report

Static analysis result for SHA-256 552391e75ef9bc17…

MALICIOUS

PDF

78.5 KB Created: 2021-03-20 15:58:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2a88ceae3bf4d2a15e4e50f5e9607b66 SHA-1: 88e2f30765028c5bf175e00fbcc14b21ef92abb4 SHA-256: 552391e75ef9bc17b23caa086e5d91bc4921ced1c86c998e9b83df52cc454707
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm. The ML classifier strongly indicated maliciousness, and the presence of numerous links to potentially disposable hosting suggests an attempt to manipulate search engine results or distribute further malicious content. The primary IOC is the initial external URI, which could lead to a malicious payload or phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://resalured.ru/123?utm_term=bunting+template+free PDF link annotation
    • http://meziradidanaru.iblogger.org/69834869252.pdfIn PDF document text
    • https://satataro.weebly.com/uploads/1/3/5/3/135350270/lozutipejadixuzu.pdfIn PDF document text
    • http://pidikugojan.22web.org/baby_girl_names_starting_with_m_unique_with_meaning.pdfIn PDF document text
    • http://kirudoxidezogu.22web.org/zurusaxaparij.pdfIn PDF document text
    • http://bozenuvobe.iblogger.org/how_dark_souls_3_dlc.pdfIn PDF document text
    • https://fuwipinax.weebly.com/uploads/1/3/4/0/134016709/xiromudike.pdfIn PDF document text
    • https://ludexibof.weebly.com/uploads/1/3/4/6/134638297/791440.pdfIn PDF document text
    • http://kuxogajow.iblogger.org/37734289497.pdfIn PDF document text
    • http://jaraxusej.iblogger.org/coloring_worksheets_for_prek.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/8508e72c-b3e6-43d8-ad3b-53b8ace6f372/42236386492.pdfIn PDF document text
    • http://berodibanubaj.rf.gd/frog_dissection_lab_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34acc8e6-b84d-4914-973d-49c3344b52ae/93546325280.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66859a8d-19c6-40b1-93c3-519305e6b217/what_is_restriction_2_on_a_drivers_license.pdfIn PDF document text
    • http://nezaxominif.epizy.com/8987830170.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92d300c4-8dc8-4564-b86a-abf3fa8f9b8c/how_to_fix_fisher_price_swing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40b35969-ac48-445c-aae3-9d23efa0939a/cuanto_equivale_un_metro_cubico_en_cm_cubicos.pdfIn PDF document text
    • http://luwefotikejumu.rf.gd/feranavowigatasevolog.pdfIn PDF document text
    • https://06e27459-8a58-4d01-a48e-f853eab966f6.filesusr.com/ugd/55f1a0_047843a7cef345d29ee9a24c3de6d7b6.pdf?index=trueIn PDF document text
    • http://vewetumizobu.rf.gd/72489186354.pdfIn PDF document text
    • https://6448a590-b571-4b71-a9e4-820b8531b153.filesusr.com/ugd/782be2_213e0f977c744ab3978457695d2ac50d.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_off0000f6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A8 5092 bytes
SHA-256: a952be6eb81d6843c125fde467ec9bd4de5de3cd68e3ccb0c62519e4d14fb9ea
font_01_sfnt_off000107ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EA 10888 bytes
SHA-256: 79e26439ac0e1acec87928b872b6f9d0baef8efb36ed2ab156b4a0c5d8a995d3

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