Malicious PDF — malware analysis report

Static analysis result for SHA-256 d757b5f76542e0dc…

MALICIOUS

PDF

42.4 KB Created: 2020-11-06 03:58:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 56889b605a01d1f3ddc8906f21027065 SHA-1: 1ad962f016ff818e2ceced4d22b6bd82f1a8d4d9 SHA-256: d757b5f76542e0dc6bb8b971dcc5f32284010c19841dc60263bba31561b2d690
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=words+that+start+with+the+prefix+an PDF link annotation
    • https://mufuxavezefajox.weebly.com/uploads/1/3/4/4/134497947/bbc48ed1f852c.pdfIn PDF document text
    • https://ginefudev.weebly.com/uploads/1/3/4/4/134454890/mixakozazufegali.pdfIn PDF document text
    • https://kafaziwe.weebly.com/uploads/1/3/1/0/131070109/812221.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/wunupalezozerud/jisokenitejuvod.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/76293210357.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/azur_lane_mod_apk_3.1.15.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/98041159104.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ed4f154-0839-4ca0-9e4d-45b33028d766/xekezebexadepaw.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/imperial_cooking_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/bahay_kubo_architecture.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/fingerprint_recognition_biometrics.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/buresuvorimijekikapupeka.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/employment_termination_letter_fillable.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_off00006432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6432 5268 bytes
SHA-256: 2f85977d14a87411bf409a33516e543e057dff196d79412bf60f39ef8d4ecfd1
font_01_sfnt_off00007636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7636 11676 bytes
SHA-256: 189779dc1f5e8d455c17b616c8a245f925bb2de2805d2e40939c70799d1e65b2