Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e07fb0a01ca9e24…

MALICIOUS

PDF

105.5 KB Created: 2021-03-19 11:17:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 738426cae42c4cb7adb16f2d608e50b3 SHA-1: 105be628408127f4403e0b20c51f414cfd27ccfd SHA-256: 2e07fb0a01ca9e2417b14cd781759f77306c588d73c3084fa478a927ffd88dcc
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 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://nipisod.ru/strik?utm_term=rem+700+short+action+weight PDF link annotation
    • http://sweetmeet.online/49180480346u17g4.pdfIn PDF document text
    • http://cookwellbakewell.com/les_choristes_la_nuit_piano_sheet_musicljz34.pdfIn PDF document text
    • http://electorat.org/grumpy_cat_30th_birthday_memefid26.pdfIn PDF document text
    • https://tujobofawoti.weebly.com/uploads/1/3/2/6/132695409/d4cefa2df1820.pdfIn PDF document text
    • https://cdn.sqhk.co/pevotido/gfwc3ia/coliformes_termotolerantes_em_alimentos.pdfIn PDF document text
    • http://merovew.xyz/xuzidudaduruwijv1ax.pdfIn PDF document text
    • http://form-lnstagramcopyrightservices.com/3245948691s5pm4.pdfIn PDF document text
    • https://cdn.sqhk.co/tokotuxajif/B4ggWgc/unlimited_car_driving_simulator_mod_apk_revdl.pdfIn PDF document text
    • https://cdn.sqhk.co/fapewakuw/gOtRohj/viwapele.pdfIn PDF document text
    • https://gobunelesivuwol.weebly.com/uploads/1/3/2/3/132303092/fibejij.pdfIn PDF document text
    • http://copyrightnotice-ig.com/22974184135tkxeo.pdfIn PDF document text
    • http://gebuhrenfrei-mein.com/muxukuxiwowdk3ay.pdfIn PDF document text
    • http://oneitstore.info/singer_futura_quintet_embroidery_machinetfx4k.pdfIn PDF document text
    • http://20970907.net/5821572426nu6l.pdfIn PDF document text
    • http://hotsales-com.xyz/pawaxejigugor1e9y2.pdfIn PDF document text
    • http://verifybadgehelp.com/pupegofapivekuwik3o09.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_38dd631d2a8f47eba1eeebd44881258b.pdf?index=trueIn PDF document text
    • https://c931c956-7f53-4e4e-96dc-27d7f003ba63.filesusr.com/ugd/b80c10_0adcd863a1d143078e89e1414fe0a351.pdf?index=trueIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_2e9f50f29b094739b8d38e4e85afa894.pdf?index=trueIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_a42eedce165545e5bd40872b78ebd34d.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
    • 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_off00014659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14659 5504 bytes
SHA-256: fb0ef819b9e6b1ca41f98f3b26dbcaba763a4d82182c51a267588921bd4e051d
font_01_sfnt_off00015904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15904 12536 bytes
SHA-256: 533c8904195bebafd3045fd49108bd002efabbf56adf351638073b3c5b29a6f7
font_02_sfnt_off000183e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183E9 16060 bytes
SHA-256: c43c81af3addadc619f1b50b0eb79006c69e58cb90abf43f7a5fbd940e22698c

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