Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd0a5dc61f5c0bc4…

MALICIOUS

PDF

68.2 KB Created: 2021-01-25 14:54:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 86403fab5771330960e84244be232117 SHA-1: 3c0dbe20d5b358ef20127627d0d7785be0a28e56 SHA-256: dd0a5dc61f5c0bc43c17f2014c4e237a6d24965471fe61a8171339729126d298
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary suspicious URL being https://druttle.ru/123?utm_term=ufc+235+live+stream, which is likely used for phishing or to serve a second-stage payload. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is part of a link farm on disposable hosting, further supporting a malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • 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://druttle.ru/123?utm_term=ufc+235+live+stream PDF link annotation
    • https://tidukefawa.weebly.com/uploads/1/3/4/8/134851120/2690298.pdfIn PDF document text
    • https://cdn.sqhk.co/xatijafuwami/Pjf2HSL/tripp_trapp_stokke_high_chair.pdfIn PDF document text
    • https://pefisidedufe.weebly.com/uploads/1/3/4/9/134902532/putadomaneb_kimigazidojarav_vetovafodirobew.pdfIn PDF document text
    • https://dolevepi.weebly.com/uploads/1/3/4/5/134587457/8816612.pdfIn PDF document text
    • http://ctyr.ru/toca_nature_applicationp4i6m.pdfIn PDF document text
    • https://zokelafeg.weebly.com/uploads/1/3/4/8/134889419/vunisovuximabar.pdfIn PDF document text
    • https://mediwamogapani.weebly.com/uploads/1/3/5/3/135318379/xaxujixebaje-besovok-wutite-ligomuminebege.pdfIn PDF document text
    • https://cdn.sqhk.co/zogameva/eihLWM3/ruzanebazutejexidabug.pdfIn PDF document text
    • http://italy50wow.pro/14627009729tk0py.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/baritexovopa/markdown_cheat_sheet_numbered_list.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/fleur_de_lis_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/maboxafazugotesavefaxi.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/utorrent_movies_app_for_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/fonap.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/green_bay_packers_davante_adams_injury_report.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_off0000cd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6A 5496 bytes
SHA-256: b4e4ea425c3ad39adb0bbe1ac3847e46fd2f4aba54259d2e244f6b46c7eb1ea2
font_01_sfnt_off0000e01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01F 10544 bytes
SHA-256: 6dea49d03d4d70a050fb4cb00f3b268eeccbb2cb600e5ae06dd289d1ad302bb4

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