Malicious PDF — malware analysis report

Static analysis result for SHA-256 8025d5f5cc7ee18a…

MALICIOUS

PDF

70.3 KB Created: 2021-01-14 12:10:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f6c0dd917d375019daefd1a1e1cf7041 SHA-1: e6b63731963a5d9ed4ee6035e86267eccd359952 SHA-256: 8025d5f5cc7ee18a94aa54f4f85c98e215644ce3b338d502d6eff864abe2c539
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'six trig functions worksheet pdf', suggesting a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=six+trig+functions+worksheet+pdf In PDF document text
    • https://site-1180277.mozfiles.com/files/1180277/lesajo.pdfIn PDF document text
    • https://site-1166704.mozfiles.com/files/1166704/dinosaur_simulator_2_dino_city.pdfIn PDF document text
    • https://site-1168232.mozfiles.com/files/1168232/40391775094.pdfIn PDF document text
    • https://site-1168507.mozfiles.com/files/1168507/choomantar_remix_song.pdfIn PDF document text
    • https://site-1204364.mozfiles.com/files/1204364/dream_winner_soccer_2020_mod_apk.pdfIn PDF document text
    • https://site-1171133.mozfiles.com/files/1171133/9719075567.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380073/normal_5ff75596ab611.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/nazekisigiduz/90014148862.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/eriksons_theory_of_psychosocial_development.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/bahubali_film_hd_video_songs_free.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_off0000d68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68F 5500 bytes
SHA-256: 658bd6f8811570287480d7b9107c6a385ba3146fa875c5b96c6b18da78252c85
font_01_sfnt_off0000e965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE965 10580 bytes
SHA-256: afe40ec9101316a0f175613e57760fed18521e3b5b5f9cec96a479ee24624a26

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