Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a0e22b5bae1233…

MALICIOUS

PDF

54.9 KB Created: 2020-11-09 14:29:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: ae63ae11b15eddb25531863f6d5449a4 SHA-1: bce009f94cab2ff21b4dd923598b1ed1ea1622c9 SHA-256: 87a0e22b5bae1233456a8a44554e5b8478ba2f2f402c5f36a4f932a9a9ee20a5
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=ar+15+complete+assembly+guide+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367271/normal_5f89c19161537.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376098/normal_5f905650491aa.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/62f68a87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412408/normal_5f9e51efbaeaa.pdfIn PDF document text
    • https://vofixerexelisat.weebly.com/uploads/1/3/4/3/134311693/rategubevamawisi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fb4957e-638d-4502-9c38-a1b90910d828/wendys_salad_dressings.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/bon_jovi_divorce.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/526f40b1-bcff-41a0-af5f-7efd24fc0fa6/after_movie_google_docs_mp4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6523d1bd-7fbc-4c92-ad8d-526fe09b2e5c/jubasofivilixugefinow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdbcda15-befd-428d-9ea8-55623c201da6/zuzogi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f697ae5c-d847-4765-84e3-2a07354bf134/xuxixosofutudoronijo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01afe19d-855a-462c-9bae-914e230f35ae/optoelectronics_and_photonics_kasap.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/mobiluduxewilenapigarun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21533bae-3d31-453c-83aa-f03987a599d1/34925729868.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_off0000962d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x962D 5884 bytes
SHA-256: 065b27c7a3c9c232df65770eb1060b1fe541496dee5a0e2a9651f1a8df447535
font_01_sfnt_off0000aa2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA2F 10576 bytes
SHA-256: 6260d95fa28ce0f71dcbc98233d429a9668b9b7cf82fa1e7d2a58cbaf695d66a