Malicious PDF — malware analysis report

Static analysis result for SHA-256 f782e297ad1a70bd…

MALICIOUS

PDF

43.4 KB Created: 2020-11-08 16:56:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: 8fd836eb1fcb7ed8d184981b15ede749 SHA-1: 2cffb8bbb5b9857e88fc7089ad5c6190fefe7337 SHA-256: f782e297ad1a70bd0f37d140c3aec0a6cc2c5e408f31d0e94ee92927d6664995
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=recover+my+files+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418984/normal_5f9c9877b0c2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383149/normal_5f8fbf234e41e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423696/normal_5f97b6cc37b4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451028/normal_5fa154c67f63e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443802/normal_5fa0dabf97bc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391001/normal_5f9f7bae226da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366331/normal_5f8737d40cfce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405904/normal_5f965e451f283.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455890/normal_5fa2b217a5bb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380881/normal_5f90dc9bcad31.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/zuguvoxoki/apk_file_android_studio.pdfIn PDF document text
    • https://vojasajufuda.files.wordpress.com/2020/11/hekate_switch_guide.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_off00006af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF5 5392 bytes
SHA-256: 0ffafe1898a83f706bbef4e03f1aec99d31f956cfd1da779caddcf6ac3f72d86
font_01_sfnt_off00007d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D53 10548 bytes
SHA-256: 32925bb8f2c1b30ba2ef98f1ea01d78e7c8fc379f05833aef7c537cc5d1d762d