Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b112453e9820b40…

MALICIOUS

PDF

84.3 KB Created: 2021-02-22 08:07:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ee42ef416bac69f80c49fc57b5be79f0 SHA-1: 376cfa4750bba02d2f868c9e4f124ec59390a730 SHA-256: 1b112453e9820b40fab3b87bce3bcdeef37ddc72deed73cb2ad358d42cf3d728
66 Risk Score

Malware Insights

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

The PDF document contains numerous external links, with a high concentration on disposable hosting, suggesting a link farm or SEO abuse tactic. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs points towards an attempt to redirect users to potentially harmful sites. No scripts were extracted, but the overall structure and heuristic firings suggest a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://leonvi.ru/wb?keyword=ace%20personal%20trainer%20certification%20cost PDF link annotation
    • http://chestlune.online/dsc_832_clear_trouble_lightxxnj8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471971/normal_600baa5ec8722.pdfIn PDF document text
    • https://cdn.sqhk.co/joxomawezu/jfjcTjh/konij.pdfIn PDF document text
    • https://cdn.sqhk.co/ropobemuma/XMe3zjj/jagetalubuk.pdfIn PDF document text
    • http://vidclips.design/hpe_aruba_airwave_datasheetyo6ss.pdfIn PDF document text
    • https://cdn.sqhk.co/sunawopi/l2jbA9e/tripp_trapp_cushion_etsy.pdfIn PDF document text
    • http://alkim.xyz/simple_man_guitar_sheet_music_freegyhen.pdfIn PDF document text
    • http://reawolt.online/76241921873rlaah.pdfIn PDF document text
    • http://wwnews.site/fake_caller_id_apk_cracked_freedz28p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482869/normal_5ff7bfac69f1d.pdfIn PDF document text
    • https://cdn.sqhk.co/duditizonut/5hgiIci/takoxumogivugebelil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421360/normal_600bb0fb9d38a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379613/normal_5fd1f6bd27d05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415962/normal_6021636a3f938.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401703/normal_5fe4f8043c7cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426676/normal_5fda1727515df.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/dewazewokib/juragipokazimabakereg.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/inochi_no_namae_violin_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/1752333375.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/bajamagulebofujupapiseb.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_off00010cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDF 4996 bytes
SHA-256: 598624839fc86a071adf5acc0512e9aac3acc3e72a6efdcb922a857f8db8d8a5
font_01_sfnt_off00011def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEF 11140 bytes
SHA-256: 15e742508c1493b70f849ff3264f8b746d0c79a7a0917c0ae326bf415facd707

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