Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7858512d53de327…

MALICIOUS

PDF

76.0 KB Created: 2021-02-05 17:49:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7e93545c2d1bc9f3c0c99975ff6619dc SHA-1: e87f6c91347fdf2e538f1eb1cb4d6b960b2fb278 SHA-256: b7858512d53de327bd575d951fbe757554b10dc760eea4c75c0c92054a844d83
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a high-severity heuristic indicating it's an SEO redirector link used for phishing, specifically a 'free-download' lure. The primary URL, https://maypoin.ru/123?utm_term=minecraft+flash+game+unblocked, is embedded and likely leads to a malicious site. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/123?utm_term=minecraft+flash+game+unblocked PDF link annotation
    • https://cdn.sqhk.co/jokawefezo/9jdiiJm/spellbinders_dies_nz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485001/normal_5fda8e138bd25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499995/normal_600c0f3ada4e5.pdfIn PDF document text
    • https://cdn.sqhk.co/kimefutif/khgziaF/galaxian_3_ps1.pdfIn PDF document text
    • https://cdn.sqhk.co/kekoseni/Ajiziha/ditoninudopovarixune.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417527/normal_5fc5973c9811d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447914/normal_5fdc89b491f4a.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/ygejige/32485149764.pdfIn PDF document text
    • https://cdn.sqhk.co/zodozane/fKahfjc/rupedebek.pdfIn PDF document text
    • https://cdn.sqhk.co/xeposetuge/qaichid/battle_tanks_2_download.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/hhuX5hf/56648918606.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/nuxomigo/clorox_wipes_ingredients_safety_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/79849892440.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/annual_report_of_ibn_sina_pharmaceuticals.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/android_9_dark_mode_oppo.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_off0000ed52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED52 5644 bytes
SHA-256: d1ef0efaba9082a1eeb1b30e68f4cfdb2687d226f5bf8a5c1d34597024e69400
font_01_sfnt_off00010063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10063 10268 bytes
SHA-256: 7af2d4c9bc04a1fee4be87b1650e21ea06c7b0a19937893f2f97898bcf8d390d