Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb03dc61e32eb4e…

MALICIOUS

PDF

70.9 KB Created: 2021-02-15 00:47:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 507f7d612c382f4035623010c8dd06f9 SHA-1: 574af6d9f10ca1e68420ab16cdd0533efcf546e5 SHA-256: 8fb03dc61e32eb4e19ad4b367730ec25fb48f78e8901d421128ce4c308031ba7
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=neopets+wise+old+king+cheats+what+to+say PDF link annotation
    • https://cdn.sqhk.co/tusadopovet/hgVwhey/uncharted_fortune_hunter.pdfIn PDF document text
    • https://lodobapidadisu.weebly.com/uploads/1/3/1/1/131164557/feperaxetaxesol_nabunemitu_xenalu_xabifu.pdfIn PDF document text
    • https://nekamefirojes.weebly.com/uploads/1/3/0/7/130739169/6768296.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/ejg4ghl/pavuxovanajikorisu.pdfIn PDF document text
    • http://instahelpforbusiness.com/ludagatagenifuduvul172we.pdfIn PDF document text
    • http://creditscorefix.info/buell_xb12ss_owners_manual2v4v5.pdfIn PDF document text
    • https://bifukedupojuxi.weebly.com/uploads/1/3/4/4/134498794/9374065.pdfIn PDF document text
    • https://pudisemibupar.weebly.com/uploads/1/3/4/0/134096773/birunofarutuluz-gogodenulaxew-laxugifilasa.pdfIn PDF document text
    • https://kaxamutibe.weebly.com/uploads/1/3/5/3/135348628/denibekabimo-penuf-zopabitofo-pawulalodi.pdfIn PDF document text
    • https://cdn.sqhk.co/kavonalitego/nhgTgjS/flying_birds_gif.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/tazopaju/renuwakuf.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/mabovivonilixitevo.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/best_video_editing_software_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/96020213258.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/pojubonoxemitulad.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/bb_link_q5.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/sixaremogixekudosuzavopa.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/boult_bluetooth_earphones_user_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 PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F5 5464 bytes
SHA-256: cb2e0a5de6313295d4e781e35377790b354a378b294ef07dad04f4a427a8f467
font_01_sfnt_off0000e9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AD 10804 bytes
SHA-256: 5d1f44447b14919b3f3032a78626dd075ae62fd3ae18902eaf3da160e774038e