Malicious PDF — malware analysis report

Static analysis result for SHA-256 1efc3e179af3e1dd…

MALICIOUS

PDF

70.2 KB Created: 2021-03-27 23:24:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 82945097608f76b34a82593a46869330 SHA-1: 5c3ec1afdda9295886193a80ce64d3351e865a4d SHA-256: 1efc3e179af3e1ddbb6c6ff28025967f2aea7ca4ecefbf60de4477c9a6091a3d
74 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mezovuduw.ru/award?keyword=spider+man+comic+book+pdf+download PDF link annotation
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://cdn.sqhk.co/bajilevone/jbiaii6/demolition_derby_3_mod_apk.pdfIn PDF document text
    • http://dosubodanes.mypressonline.com/my_imitation_of_christ_book.pdfIn PDF document text
    • http://sejujanovemo.medianewsonline.com/akuntansi_biaya_tenaga_kerja.pdfIn PDF document text
    • https://cdn.sqhk.co/finulepaf/iggPFii/81183258830.pdfIn PDF document text
    • https://cdn.sqhk.co/mujowofapubi/chbghyC/5554652856.pdfIn PDF document text
    • http://homiak.fun/unbonded_strain_gauge9uc27.pdfIn PDF document text
    • http://ratixopawem.mypressonline.com/auggie_and_me_online.pdfIn PDF document text
    • https://cdn.sqhk.co/fusaduxuw/N6idd2s/88192243869.pdfIn PDF document text
    • http://ruwosiju.getenjoyment.net/15714692207.pdfIn PDF document text
    • http://com-signto2.xyz/chambers_21st_century_dictionary_freej6fzf.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/831ff491-4554-4a69-a3ad-8ea978def86d/2012_honda_civic_manual_transmission_fluid_type.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d8bae7c-5e7e-402e-ae6c-0f4d1bedcb78/puxuxodotexigigoz.pdfIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/guvajobonulara.pdfIn PDF document text
    • http://tuzuxutetug.atwebpages.com/wogodiwegivo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/019e5494-4ac1-4ec7-ba63-fde08bf09686/velleman_how_to_prove_it_3rd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2c37ddd-7469-41ff-bbe6-5b2fb4f054ca/on_the_uses_and_disadvantages_of_history_for_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ad4cacd-44f6-4db2-9ec5-338f2bf59463/witofagigoweserarepabejuf.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_off0000d1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DF 5520 bytes
SHA-256: 2aa517b6d05381f9f73efd3bf60770fcfe7a91e5016384fd3d2c95a35f5a8c9a
font_01_sfnt_off0000e49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49F 11496 bytes
SHA-256: 43e56fd91619d3ab559113cbfca658ee79070ffbf0bf7250e2a66c48a021ef71

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