Malicious PDF — malware analysis report

Static analysis result for SHA-256 70432233f0ca5b71…

MALICIOUS

PDF

47.6 KB Created: 2020-11-09 03:57:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 68dd9ba54e7a4f0c879a12b351670308 SHA-1: 2e10c7b5c69039ead5cb27b6c392ed1c6d2bcd58 SHA-256: 70432233f0ca5b7136779a59a1fe0d82b92ed13fe7be1366a28d13f3d3d20b64
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=stem+and+leaf+plot+worksheets+for+4th+grade PDF link annotation
    • https://libadelalisam.weebly.com/uploads/1/3/4/5/134579317/6070115.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388162/normal_5f8f76ea73fe1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411480/normal_5f9dc609144db.pdfIn PDF document text
    • https://deximuxinudob.weebly.com/uploads/1/3/0/7/130739142/kudizax.pdfIn PDF document text
    • https://pituluwo.weebly.com/uploads/1/3/1/4/131437949/nusagalek-fidelegiluxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367964/normal_5f8887189a166.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://zatejoru847961968.files.wordpress.com/2020/11/72489844693.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/ak_47_wood_furniture_stock.pdfIn PDF document text
    • https://sisiviweze.files.wordpress.com/2020/11/goresosuvufat.pdfIn PDF document text
    • https://tutitogigu.files.wordpress.com/2020/11/11656611734.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/406_woodruff_key_dimensions.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/watch_burn_notice_season_1_episode_2.pdfIn PDF document text
    • https://woremuses.files.wordpress.com/2020/11/51402975925.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/71825285317.pdfIn PDF document text
    • https://dilopipo.files.wordpress.com/2020/11/demetivudaxakoleze.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/wiczenia_gramatyczne_angielski_b2.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_off000076eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76EB 5800 bytes
SHA-256: 3c1289a25f833b3777be24b67159bb73750ccde6d2df8cb5c4922187eba841fe
font_01_sfnt_off00008a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A98 11512 bytes
SHA-256: 53e0b1006b184bd5fcb09d3932a1a8d12c0a25b8a788e4a3039964efa506eec3