Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0096d0f7488b865…

MALICIOUS

PDF

79.8 KB Created: 2020-12-27 16:52:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a30653bf52f89c8febc229b4d346ccb9 SHA-1: d14f2540d05b2eba7190d3b3dc1c7cbcbe11f4f7 SHA-256: f0096d0f7488b865af86b6f875d7c899925a909d873c605ec9b1d65bfec1aa53
136 Risk Score

Malware Insights

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

The PDF contains a high-confidence ML classification and ClamAV detection indicating maliciousness. A heuristic identifies an image lure linking to an SEO redirector, specifically 'https://trafffi.ru/strik?utm_term=slither+io+games+for+school', which is designed to trick users into visiting a phishing site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/strik?utm_term=slither+io+games+for+school PDF link annotation
    • https://cdn.sqhk.co/lawafopugu/ijhaFqr/inspirational_stories_of_changed_lives.pdfIn PDF document text
    • https://cdn.sqhk.co/joraxeneli/dgeedib/doom_2_online.pdfIn PDF document text
    • https://cdn.sqhk.co/vefutifeves/Fgd5ifd/ghost_rider_3_movie_trailer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406809/normal_5fe429f92b2c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368477/normal_5f8c1bacdc15b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dojonuta/busisox.pdfIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/simple_html_bootstrap_admin_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8217a79-31e6-45bf-b330-441a4c63bc63/white_alaskan_husky_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db2890fd-d349-4bda-bbbf-b79b071bd1d3/college_algebra_exam_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9314960d-9ea6-436f-9346-5890d90a6ee0/rosario_de_la_liberacion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efa5308b-db78-459a-a3f2-95f133c85ae4/general_lee_dixie_horn.pdfIn PDF document text
    • https://s3.amazonaws.com/degerutisig/old_gospel_songs_with_lyrics_and_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/10792811267.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF8 5080 bytes
SHA-256: 33bc1a0b68d4d3f70a88600c525e53ca4f657ba33aea91c81b9b3572d4d42dce
font_01_sfnt_off0000ff38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF38 10864 bytes
SHA-256: 0a38cf0c4ea7610faab43a8691b7523d9a899823df31b67be5a373c360ff09d5
font_02_sfnt_off00012428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12428 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3