Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f7b9ee2e87678a…

MALICIOUS

PDF

41.5 KB Created: 2020-11-05 16:44:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: 034467eaccb07f8cf5c3df05eaf0891d SHA-1: 8afcea02d325ae4d84ded731d42db435f208d541 SHA-256: b5f7b9ee2e87678a75b9435c4546523a621972088f090dc4142ce19beeef2d1c
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://trafffi.ru/123?keyword=military+dog+training+manual+pdf PDF link annotation
    • https://jubunukaf.weebly.com/uploads/1/3/1/4/131483214/8278019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370068/normal_5f9cf6a3b22c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419644/normal_5f9c5a8e58540.pdfIn PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/5168799.pdfIn PDF document text
    • https://folemazilepi.weebly.com/uploads/1/3/1/1/131164248/8383433.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/wotukomomig-safozepogadala.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393486/normal_5f9eb396cca8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380213/normal_5f98081d2e6ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409248/normal_5f9b087928f57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418167/normal_5fa1ef2a4fdb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368962/normal_5f8911ee4fa1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428083/normal_5f995daae860c.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/mipeboro/41675694100.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/antiinflamatorios_esteroideos.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/dog_fight_2_unblocked_hacked.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/56939886519.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_off000063f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63F9 5288 bytes
SHA-256: 3b4712a6d9d24ffc6a3ecda00d5fa26c6f6279526f1ab18d2a87340205312b73
font_01_sfnt_off000075f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75F9 10216 bytes
SHA-256: 82f51de40794392722cbf1f0910e74edf709eab4130d399d4244d8af4bbcf781