Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f00e08ea6f13524…

MALICIOUS

PDF

85.2 KB Created: 2021-09-18 00:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a6aa7162c5ed27a2630e3e3270cefedf SHA-1: 413bca3fb2f6e58dae5b2972471b643191d34941 SHA-256: 1f00e08ea6f13524aee6760bbfcb7ad0750ae97feb1a752c6a13937ebf8b7f62
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a phishing or link farm operation. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the sample for using disposable hosting and UTM parameters, common in SEO-poisoning or phishing campaigns. While no scripts were explicitly extracted, the presence of numerous external URIs strongly suggests the PDF's purpose is to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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 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://wastran.ru/uplcv?utm_term=facetime+on+android+phone PDF link annotation
    • http://seibyou-koujien.com/files/files/viduxotajikitidomodijim.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/leporulo.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/kuduguronomuxodaparaviso.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/161414351ca4dd---91067218198.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142401a7185d---2450770616.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/wamiginipubibajonali.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/tuzukitudisiretaro.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/76694642830.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/leperebog.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/59129465125.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/juxoxeburomufor.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/risozepox.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/wirumisovurexurodikured.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/tapebit.pdfIn PDF document text
    • http://voijin.com/userfiles/files/zuvafoletumexakijewaj.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///jewevuwuborabibamaxu.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/woduzakakizezeriselejob.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210909132745.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/68193280081.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/loxefezufimuzonuwebuzafet.pdfIn PDF document text
    • http://rc-modeller.se/images/file///89382471043.pdfIn PDF document text
    • https://sanagustin.cl/files/gekaxagarapowirife.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34455710226.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE924 10540 bytes
SHA-256: 2a642de86552042251d4cab73a59e14d435fd7ce8fea643b28f1f0417b6e2d7c
font_01_sfnt_off000100e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E4 17620 bytes
SHA-256: bbc0407bce5bb8cc425f6aa27d1c3860b02556ab1b9ec574c90af826931f58be
font_02_sfnt_off00012eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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