Malicious PDF — malware analysis report

Static analysis result for SHA-256 472aada270b6e31d…

MALICIOUS

PDF

78.6 KB Created: 2021-02-23 22:58:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ef6702c550fdb85b0fa3765c43c87741 SHA-1: 94764f3e4233ab09d20386ef880c1847586d51e7 SHA-256: 472aada270b6e31d2d91a3957fac258fec19f0e12083edee9e44d3e03fb78b2d
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text fragments related to search queries, suggesting a phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://crophysi.ru/123?utm_term=what+does+an+1130+on+the+sat+mean In PDF document text
    • http://pixxel.life/kpop_music_videos_20205e1a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470035/normal_600d148bb4ea1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374178/normal_5fe7467d7332f.pdfIn PDF document text
    • https://cdn.sqhk.co/guludagew/YjfmGia/nonazatumozagojosifatumok.pdfIn PDF document text
    • http://tortomsk.ru/dell_inspiron_6400_screen_price_in_indiap6yje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417423/normal_601fbf601d964.pdfIn PDF document text
    • https://cdn.sqhk.co/nekuripafi/iojhnha/fenakelujotumomiwitava.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzujugasije/xTAjgia/arabic_ringtone_10_hours.pdfIn PDF document text
    • http://businessoutsourcing.org/ventajas_y_desventajas_de_la_educacion_inclusivaepaa8.pdfIn PDF document text
    • https://bemakidej.weebly.com/uploads/1/3/0/7/130739127/mowivuxuwofa-nidumadunakinix.pdfIn PDF document text
    • http://tryse.xyz/lefamewesukubozujofujeswbf0m.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/falufusu/flute_songs_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/information_about_pakistan_resolution_day.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/gymnopedie_no_2_sheet_music.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_off0000ec09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC09 2900 bytes
SHA-256: a28fcc4ba65d8171a55e8b87d646ac5d1dd213f66ab2b0026fd39e5ca5d32d1a
font_01_sfnt_off0000f64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64B 5308 bytes
SHA-256: ae1682b65e44ea61c5c2835720bab65f0a2b5e3018bade2733b06e1a61a31abd
font_02_sfnt_off00010844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10844 10864 bytes
SHA-256: d6c82b1cf45267dccb1f8669c7499d625fc209ca9393736110100281906c05bc

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