Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2aa7a31590129fd…

MALICIOUS

PDF

83.5 KB Created: 2021-09-13 21:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: fc09b4d102c18fd825004493d4638b60 SHA-1: fa34b77ffdafdecefa2e674986f0a91b5b2cc067 SHA-256: d2aa7a31590129fd5a9852e09bcaa728a12e7f30f566b94f72bf2b904b30c87a
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 0.9974

Heuristics 4

  • 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 http://beijingteye.com/upload/files/93094340497.pdf In PDF document text
    • http://madonnina.info/userfiles/files/lunobobavizirap.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109020157078894.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/39528069714.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/takipowavorawisevid.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/45409348643.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/37975341983.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/3746706010.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/43680196987.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/zigafok.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/rijuzimuveridezi.pdfIn PDF document text
    • http://cortabellanews.com/userimages/96551025276.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/35776214299.pdfIn PDF document text
    • https://cityface.cz/res/file/18755274519.pdfIn PDF document text
    • http://esangsok.com/upfile/files/70102321715.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/47274841648.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/27415136895.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/92223815913.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/pugom.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/mibofusorukunobedarowal.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/8694787004.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/tifenigob.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/dogalokamidogudovika.pdfIn PDF document text
    • http://sns.hu/_user/file/53800942974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=watch+bachelor+in+paradise+season+3+online+freePDF link annotation
    • 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_off0000dd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5E 11020 bytes
SHA-256: 251a78f9bac1b3bb2f69a3bbc8cd891d250c484d8f24bf71eb35241a3894b751
font_01_sfnt_off0000f6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDD 18928 bytes
SHA-256: 65adf452927a6f033d35f9781037e498a5061735d58566574f86f9fdb37b0e43

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