Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b1c70c886a019c9…

MALICIOUS

PDF

52.5 KB Created: 2020-04-04 16:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-15
MD5: 6d50fb543f4cf7f07fac1a08fac665a0 SHA-1: 21c19ee360c227c4f3243b76651cd891ec0ddb67 SHA-256: 3b1c70c886a019c991a60ae41ddd6a745e19b1fd08f0dd424b740146404e17ab
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains a reference to 'Exercicios de quimica organica grupo funcional' and a URL, suggesting a lure to educational or informational content. The primary attack pattern involves redirecting users to a network of potentially malicious or SEO-abusing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://kreativekidsworld.com/uploads/1/3/0/5/130590665/130590665.html#exercicios+de+quimica+organica+grupo+funcional PDF link annotation
    • http://hausdoerffer.com/uploads/1/3/0/3/130313410/45ad32e59087.pdfIn PDF document text
    • http://identityconcept.net/uploads/1/3/0/4/130489044/nubuluvibubo.pdfIn PDF document text
    • http://leerstichting.nl/uploads/1/3/0/5/130589095/jivop.pdfIn PDF document text
    • http://sbkbullies.com/uploads/1/3/0/7/130740192/4506343.pdfIn PDF document text
    • http://cookielovecustomsugarcookies.com/uploads/1/3/0/7/130739598/2338065.pdfIn PDF document text
    • http://dialin.morganadvisory.com/uploads/1/3/0/5/130590380/7960933.pdfIn PDF document text
    • http://kezkez.com/uploads/1/3/0/6/130604606/21bf0d6edb47490.pdfIn PDF document text
    • http://totalmassagesolutions.com/uploads/1/3/0/8/130874490/fa1fedf3ece6.pdfIn PDF document text
    • http://bodysculptorsaustralia.com/uploads/1/3/0/3/130312965/nepomin.pdfIn PDF document text
    • http://americanbasicschildcare.com/uploads/1/3/0/8/130814360/9267878.pdfIn PDF document text
    • http://desouza.vip/uploads/1/3/0/2/130272369/zedalejesufix.pdfIn PDF document text
    • http://5stocksinto.net/uploads/1/3/0/5/130551287/2786259.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8068 11060 bytes
SHA-256: 8ad5a42820aac69fb85f6543a8eda70d84419cbf529a38295f597bf997bfe605
font_01_sfnt_off0000a3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA3CC 2720 bytes
SHA-256: ce66e303b6b1b17d11857b60f8d28bbec0ff7626cc40dab7253e665432c71797
font_02_sfnt_off0000ad79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD79 16060 bytes
SHA-256: f19dc41d490b60033b52f2fdde74623f1ba9924597607807c173cf149651756c

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