Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b47be1124831b97…

MALICIOUS

PDF

77.5 KB Created: 2021-03-18 23:18:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4ba0d5c042bfcdf61903fe8c9ea5a4ed SHA-1: 548e65aad0fc338d4e6f42a340dc3afa2975b897 SHA-256: 2b47be1124831b97cd836848a38f89161d39c39f965868ab7ea3f9b37541ea63
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 0.9991

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://resalured.ru/strik?utm_term=attack+on+titan+game+2+gameplay PDF link annotation
    • http://ig-soft-team.com/57182782488bucxg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481985/normal_601df71f36a38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459320/normal_60308eda25b15.pdfIn PDF document text
    • http://xamawigokoke.mygamesonline.org/fefesafitareteboderoken.pdfIn PDF document text
    • http://czecheducation.space/nuwamevawesabotmudc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459326/normal_603032e46a7f0.pdfIn PDF document text
    • http://lilozekakotelup.sportsontheweb.net/pinos.pdfIn PDF document text
    • https://foguzutaporoma.weebly.com/uploads/1/3/5/3/135322660/tamodufefipe.pdfIn PDF document text
    • https://matigolexa.weebly.com/uploads/1/3/2/6/132682665/xaligokiwokuguzedere.pdfIn PDF document text
    • https://rakafofolobe.weebly.com/uploads/1/3/4/6/134649319/8578036.pdfIn PDF document text
    • https://zoxusikajikad.weebly.com/uploads/1/3/4/8/134851315/dezerimesopog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407318/normal_6051061a982f4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_bccdce6bd9d24fedb9c33567a1f84a9e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jovekus/diferentes_tipos_de_sistemas_operativos_existentes.pdfIn PDF document text
    • http://punotonaduwize.atwebpages.com/mifeje.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/how_to_fix_brush_size_in_photoshop.pdfIn PDF document text
    • https://52431b39-7396-4b0c-bcaf-ab72d449a1bf.filesusr.com/ugd/f8cef3_16eba3bd71c1419497462a4573782e43.pdf?index=trueIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_5339b6b2d16448bca708675f344d8e77.pdf?index=trueIn PDF document text
    • http://zuxokoberibaw.atwebpages.com/968759541.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/mapepugozosewosago.pdfIn PDF document text
    • https://4de1274e-a26b-4e71-a0d1-d86f0cfee7ee.filesusr.com/ugd/ee4d88_6ffa92bea3dd46b2847c83d82dd983c0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vapite/which_warriors_book_to_read_first.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/dixemujaxikonagadexok.pdfIn PDF document text
    • https://b6de9e3f-c562-4e05-b5ee-70895c8060ae.filesusr.com/ugd/3801ff_658f8a6ff52e4162ac385f49b90dd739.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_off0000f1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D4 5264 bytes
SHA-256: 0d1aec9f4a05c3cec5eb1453161c9d30a9825649218eb994bae690541d339ed7
font_01_sfnt_off000103c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C5 10720 bytes
SHA-256: 63bfc8241fd92d3a01194eb7a83656f3bf79d6a3153203417e48807e7d86f3d9