Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc1873647c53260…

MALICIOUS

PDF

41.9 KB Created: 2020-11-08 14:02:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9d0d3204c3384374da5facd6bfab7da9 SHA-1: 96ee58056dd9bc50e18bf699bed975ecad219d9b SHA-256: acc1873647c53260f882f20c5def8f530b8cbb9576d436d0ccd51190da9fac9f
66 Risk Score

Malware Insights

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

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 1.0000

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 https://trafficel.ru/aws?keyword=browser+downloads+mod PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427094/normal_5f9aea1a45f6e.pdfIn PDF document text
    • https://dasujodiket.weebly.com/uploads/1/3/4/4/134481559/suzepotoreneg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387050/normal_5f950c7ad16ef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/fojukufamipojewikimo.pdfIn PDF document text
    • https://bisiguxul.files.wordpress.com/2020/11/buried_town_2_hacked_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/matesinaduj.pdfIn PDF document text
    • https://fuxuvonif.files.wordpress.com/2020/11/zodaxikewejejegupinuro.pdfIn PDF document text
    • https://japegotof.files.wordpress.com/2020/11/88515737553.pdfIn PDF document text
    • https://pafegum.files.wordpress.com/2020/11/xumakosokidazok.pdfIn PDF document text
    • https://faxufiz.files.wordpress.com/2020/11/cambridge_igcse_sociology_book.pdfIn PDF document text
    • https://manetomimexa.files.wordpress.com/2020/11/68091325827.pdfIn PDF document text
    • https://pupirod.files.wordpress.com/2020/11/nozemapopumetuve.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000666c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x666C 5112 bytes
SHA-256: ca25f5e5776b2555cca9996eb2df10f3de41e89359ed78c2d2f4b8055ff49625
font_01_sfnt_off000077c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77C9 10412 bytes
SHA-256: d41e21bdc30805cf47daec6739d95405083f5aace45ff6ac65726ec81191f6c3