Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd2497ac75cad0dc…

MALICIOUS

PDF

90.0 KB Created: 2021-01-12 13:17:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 048a8dd6ee8e09c5c5fa3f5f33bb3879 SHA-1: 9fd201ddf4faeef1000b75d7f72cd673d312da34 SHA-256: dd2497ac75cad0dcd6681192b2d45c138fb4c3ff1594187d16ecc57acb61ce16
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffset.ru/aws?utm_term=shopify+turbo+theme PDF link annotation
    • https://liwujozixo.weebly.com/uploads/1/3/4/4/134497145/ceab992ece0f7.pdfIn PDF document text
    • https://site-1243289.mozfiles.com/files/1243289/legendarni_tytani_gra.pdfIn PDF document text
    • https://site-1166652.mozfiles.com/files/1166652/69680582263.pdfIn PDF document text
    • https://site-1168027.mozfiles.com/files/1168027/ates_ve_su_2_kisilik_oyna_oyun_kolu.pdfIn PDF document text
    • https://site-1178980.mozfiles.com/files/1178980/mexico_rex_free_online_game.pdfIn PDF document text
    • https://cdn.sqhk.co/sebazisop/aVgfgdQ/budulola.pdfIn PDF document text
    • https://site-1181110.mozfiles.com/files/1181110/twitter_logo_copy_and_paste_emoji.pdfIn PDF document text
    • https://cdn.sqhk.co/gobuwovuv/A0aehds/roguelike_pocket_games.pdfIn PDF document text
    • https://site-1176319.mozfiles.com/files/1176319/47919085529.pdfIn PDF document text
    • https://site-1177077.mozfiles.com/files/1177077/1725613189.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/ggyig1p/tiny_kingdom_series_4.pdfIn PDF document text
    • https://site-1175491.mozfiles.com/files/1175491/31524499590.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000123c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C1 5064 bytes
SHA-256: d7fb7929b8cf4ea68f0bf38c4eb79bbc13ad48408f4df6c8948e4deb35bdc5c0
font_01_sfnt_off000134de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134DE 11208 bytes
SHA-256: cd8cfc0caf495f1e70ae119f5724af5bd20412402b6be01375fad7321d2d8f5f

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