Malicious PDF — malware analysis report

Static analysis result for SHA-256 946ec36b4e7f4e73…

MALICIOUS

PDF

75.1 KB Created: 2021-04-01 06:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e5b8c46e88eaab92c8e2f8486b418047 SHA-1: 3e5c138365023692d40d87185b9f3f4ad8444885 SHA-256: 946ec36b4e7f4e73f8c754a42927c08a04b936b36e7d502365067951958b252f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/award?keyword=ode+to+autumn+analysis+pdf PDF link annotation
    • http://vivubowi.getenjoyment.net/bihar_board_10th_admit_card_2020_download.pdfIn PDF document text
    • https://nesipemuwazona.weebly.com/uploads/1/3/4/8/134881126/ec353b741865.pdfIn PDF document text
    • http://vezalem.iblogger.org/59734541430.pdfIn PDF document text
    • https://dakikizubebara.weebly.com/uploads/1/3/4/8/134889455/denelizivozonu.pdfIn PDF document text
    • https://zijobezugol.weebly.com/uploads/1/3/2/6/132682913/6353898.pdfIn PDF document text
    • http://wuvudazesog.22web.org/englisch_passiv_bungen_klasse_8.pdfIn PDF document text
    • http://fukerijinexin.mygamesonline.org/tarsal_bones_anatomy.pdfIn PDF document text
    • https://xatotaga.weebly.com/uploads/1/3/4/7/134726025/zexadosilajidiw-nawugarekokab.pdfIn PDF document text
    • https://pabalosuto.weebly.com/uploads/1/3/0/8/130813917/vanav_robakalenujozo_dojipedij_jopitakijexemam.pdfIn PDF document text
    • http://balifruit.com/zewegepineloxatasisj7hu.pdfIn PDF document text
    • https://xokebewogaxuwu.weebly.com/uploads/1/3/4/5/134588239/xowin.pdfIn PDF document text
    • http://mestorating.ru/filalolozegivirx39e.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/the_wave_2015_movie_watch_online_free.pdfIn PDF document text
    • http://dopelozaf.22web.org/xegedixarilosu.pdfIn PDF document text
    • https://pinobuni.weebly.com/uploads/1/3/0/9/130969003/poliw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b564fea6-732e-489f-a029-a72dc6590de2.filesusr.com/ugd/6a4619_00a83cf16ce24ef3be780def35d5fa2c.pdf?index=trueIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_e7c1f843f6fd4b08a0359923853c1000.pdf?index=trueIn PDF document text
    • http://wawutanow.epizy.com/razixipomubof.pdfIn PDF document text
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_2f0798f3636f4eeda2d8158cb517ae5d.pdf?index=trueIn PDF document text
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_34f57a9aed5043c9a329d8a77435302b.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_off0000e925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE925 5220 bytes
SHA-256: 3670c762a5a3d4a6508993c1f56d95e9222f3305773c83f661586e6f5205c956
font_01_sfnt_off0000fae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE2 10796 bytes
SHA-256: 0e645eaed55a0c081ee3066feaee896b9e870858fa941e3486b5ccf3906fa187

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