Malicious PDF — malware analysis report

Static analysis result for SHA-256 c10db30f8ca407a5…

MALICIOUS

PDF

33.1 KB Created: 2020-11-06 23:11:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 80937ccb24f902dd7cc880b1440f4df6 SHA-1: 18265c8bbf60cdd6c23ac9f7c8081b153825081c SHA-256: c10db30f8ca407a5acb9b6ee226b97e64df156fc85362a868fb0770a9d92ae48
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are to WordPress and S3-hosted PDFs, suggesting a link farm or SEO manipulation tactic. One of the primary URLs, https://traffnew.ru/123?keyword=lizard+evolution+virtual+lab+answers+module+4, is flagged as suspicious and likely leads to malicious content. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs points towards an attempt to redirect users to external, potentially harmful, sites.

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 https://traffnew.ru/123?keyword=lizard+evolution+virtual+lab+answers+module+4 PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://lesoxov.files.wordpress.com/2020/11/33364827717.pdfIn PDF document text
    • https://gorujugiximu.files.wordpress.com/2020/11/karipevo.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/molar_mass_nacl.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/free_samples_solicitation_letters.pdfIn PDF document text
    • https://gopalov.files.wordpress.com/2020/11/zazapemakumijege.pdfIn PDF document text
    • https://dowuwiridewe.files.wordpress.com/2020/11/41452109075.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2410956b-47fa-46ea-9d5b-41d6e9bb20cb/starbound_sexbound_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/gimemakeloxasa.pdfIn PDF document text
    • https://vadazigifexe.files.wordpress.com/2020/11/gopiv.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/how_to_delete_duplicate_photos_apple_photos.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/cancer_in_situ_de_cervix.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_off00004541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4541 5340 bytes
SHA-256: bc820d4926c84c30c6716a8ed3970a49f42425ee15aa2888ad54985857f8ec70
font_01_sfnt_off00005774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5774 9496 bytes
SHA-256: 3c75e192edd6e0cbda62e5abaad2a65b6304a74c8d589a1f5259bfbcc5028a36