Malicious PDF — malware analysis report

Static analysis result for SHA-256 57518aede367d538…

MALICIOUS

PDF

87.8 KB Created: 2021-04-08 00:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 13e0c0874c83e892992ebbbdfb6aac34 SHA-1: b8ef616ca15c2d7a869dfd76a8a4ca56c3cf5a3d SHA-256: 57518aede367d53805b3b25448ed78423974fe6d5b12a13f04fb5ec656244fe2
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure strongly indicate an attempt to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=danielle+steel+books+coming+out+in+2021 PDF link annotation
    • http://marikafemijo.22web.org/ielts_fever_listening_test_9_answer.pdfIn PDF document text
    • https://geridaradekod.weebly.com/uploads/1/3/1/4/131437552/luzeno.pdfIn PDF document text
    • https://xovozenoz.weebly.com/uploads/1/3/4/3/134348708/pigaripo.pdfIn PDF document text
    • https://gibekadizekuni.weebly.com/uploads/1/3/1/4/131452913/kususotogikenuv-bozedawavel-jokezuwarif-satirujesewe.pdfIn PDF document text
    • http://volelovapudexif.scienceontheweb.net/almohadon_de_plumas.pdfIn PDF document text
    • https://guzozexuvuro.weebly.com/uploads/1/3/4/3/134322735/4313516.pdfIn PDF document text
    • http://zajiledafalam.getenjoyment.net/bureau_of_immigration_departure_card.pdfIn PDF document text
    • http://baditunabupiru.mywebcommunity.org/bass_guitar_chords_chart_for_beginners.pdfIn PDF document text
    • https://punujagenak.weebly.com/uploads/1/3/0/7/130775029/4325508.pdfIn PDF document text
    • http://tejovotemikodes.getenjoyment.net/taipei_metro_map_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://56148a0a-83a3-4003-94ff-78d3044b7c00.filesusr.com/ugd/6f5f23_5cd1f1b6c6104b13acb905aebebc02a5.pdf?index=trueIn PDF document text
    • http://vurosija.epizy.com/kenmore_70_series_washer_not_turning_on.pdfIn PDF document text
    • https://e8c82854-2a0b-4c0f-82de-bac600ce06e6.filesusr.com/ugd/d017d5_045fa35774a3431191ec68954d6f95d9.pdf?index=trueIn PDF document text
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_bb43158969c7437194eabc88fb44820f.pdf?index=trueIn PDF document text
    • https://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_1d9f7c868792489ab893d2fa73edc1e6.pdf?index=trueIn PDF document text
    • http://siboxep.epizy.com/business_finance_excel_spreadsheets.pdfIn PDF document text
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_014934b9e73b4d0188f2f162cae6f3db.pdf?index=trueIn PDF document text
    • https://297de083-771a-4730-a3b8-a2afe8c7d209.filesusr.com/ugd/47424f_c88bc7f88071403e867487cf134cfc5c.pdf?index=trueIn PDF document text
    • http://gobunapuvifug.epizy.com/giriwagineximuki.pdfIn PDF document text
    • http://lopilizunutevo.rf.gd/what_rainforest_animals_eat_jaguars.pdfIn PDF document text
    • http://xadamodovupeniz.rf.gd/ilive_5.1_32_home_theater_system_with_bluetooth_ihtb138b_review.pdfIn PDF document text
    • http://lafojagifod.epizy.com/alto_shaam_tech_support.pdfIn PDF document text
    • http://witesenigo.atwebpages.com/tajiwazutirodobisunavitu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B8 5436 bytes
SHA-256: 20890bee053e618a702608c992ba44d63507f9d216e1b295dcb0bcd6430ef7b4
font_01_sfnt_off0001192e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192E 11888 bytes
SHA-256: 17988ad3ba8de2c2279ba77ae0ee0be7c671b71ef2db36395e2475d8be695067
font_02_sfnt_off000141be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141BE 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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