Malicious PDF — malware analysis report

Static analysis result for SHA-256 756a20e25cff7152…

MALICIOUS

PDF

41.9 KB Created: 2020-11-09 02:13:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-10
MD5: 09f23fe349e2ec34a179be2d37648faf SHA-1: 051eb0856b98946a3bfd644b0148d68c835ccdd1 SHA-256: 756a20e25cff71521f6690c174d1cd4cdeae6f2f394d7a241475934abd44c44f
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffset.ru/123?keyword=wow+classic+dungeon+loot+guide PDF link annotation
    • https://bakuwosir.weebly.com/uploads/1/3/0/8/130874569/1dba87367b978c.pdfIn PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/zuwerevufu_fakodo_wotinete_rajizelu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390659/normal_5fa884cdf14a7.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off0000640c.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off0000640c.bin)
    • https://uploads.strikinglycdn.com/files/176d6f51-63e3-4dda-8cae-b12c9529d741/75828899029.pdfIn PDF document text
    • https://kijemidad.files.wordpress.com/2020/11/3035765468.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/84909883488.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/monster_worksheets_for_kids.pdfIn PDF document text
    • https://fogisunewada.files.wordpress.com/2020/11/3413958129.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/gakepatiw.pdfIn PDF document text
    • https://jopafez.files.wordpress.com/2020/11/zirebenimanonif.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/51415707983.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/anisio_teixeira.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/new_fairfield_schools_calendar.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/2015_prius_c_owners_manual.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 extracted file (font_00_sfnt_off0000640c.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000640c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x640C 5116 bytes
SHA-256: 1b0e7d00a78996694e0a6679e2ba59c018be6a3a6329c4d3d9f8d78cd34200a3
font_01_sfnt_off000075a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75A2 10892 bytes
SHA-256: 6c5871eb0947546758245c37896dcc570cc77b713ba55ee390f209407cbc3734