Malicious PDF — malware analysis report

Static analysis result for SHA-256 4573b405cf5acc4c…

MALICIOUS

PDF

71.8 KB Created: 2021-01-10 15:57:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 662131eb690a98e45ce33ff3ecb50b84 SHA-1: 6943ad2fbae2bcf28316a03abc6c98d7a6075f55 SHA-256: 4573b405cf5acc4c34714fbaced3c80f93067fc590dcc4d42eff77384a244dbe
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with a primary external URI pointing to 'https://trafffe.ru/123?utm_term=d+minor+scale+bass'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed as a link farm on disposable hosting, further supporting a phishing or malware distribution attack pattern. No scripts were extracted, but the presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffe.ru/123?utm_term=d+minor+scale+bass PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4471250/normal_5ff848a9e64b4.pdfIn PDF document text
    • https://cdn.sqhk.co/joduragenep/haMhBBS/men_hairstyles_for_thick_hair.pdfIn PDF document text
    • https://site-1168059.mozfiles.com/files/1168059/80191426699.pdfIn PDF document text
    • https://taxajadotediru.weebly.com/uploads/1/3/0/8/130873824/medore.pdfIn PDF document text
    • https://site-1211292.mozfiles.com/files/1211292/fovenixolaren.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/bodipedopura.pdfIn PDF document text
    • https://tijogarukaro.weebly.com/uploads/1/3/4/7/134710746/571427.pdfIn PDF document text
    • https://gokulibom.weebly.com/uploads/1/3/4/2/134266198/95c1d1.pdfIn PDF document text
    • https://cdn.sqhk.co/godajaxox/hgiIhco/lifajabupanudebitamubosef.pdfIn PDF document text
    • https://cdn.sqhk.co/zupuguvawaj/jeAijiS/bowaduzukemoxuvubalimowi.pdfIn PDF document text
    • https://site-1176112.mozfiles.com/files/1176112/parking_near_chatsworth_house_christmas_market.pdfIn PDF document text
    • https://cdn.sqhk.co/purovufizu/hhggKge/85005918805.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000cbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF0 6744 bytes
SHA-256: ffeb89eaad713c9717385028f79c9757067aafb2c2382ea8cbab0e6efe35a425
font_01_sfnt_off0000dcd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD8 5084 bytes
SHA-256: d501f17ba0613d40fd6976c20cc3040306c929a909d99cc16d86d1ddc07c5f64
font_02_sfnt_off0000ee0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0B 10612 bytes
SHA-256: 49830d4545151f5a6b23d3d0f8b7ca32f1d22114ef29e9330793906cdce91f62

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