Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a7bc54d9e0d6282…

MALICIOUS

PDF

70.5 KB Created: 2021-01-20 11:44:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 795301c6669a4701937347cabdd1a694 SHA-1: 7ab990ca41d8521a7f8030f38b8160272c64a0d6 SHA-256: 2a7bc54d9e0d6282bc54cbfcf2d5e9797582391507cd93a3f2b2272ec395a5dc
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting services, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests an attempt to lead the user to a malicious site. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

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://trafftec.ru/123?utm_term=fine+arts+theatre+asheville+showtimes PDF link annotation
    • https://cdn.sqhk.co/keliziniw/hhhghcS/man_down_season_1_episode_5_cast.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383565/normal_5fb599166b94e.pdfIn PDF document text
    • https://cdn.sqhk.co/guledijuxi/1FSXJhg/call_lyft_driver_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471704/normal_5fad44b353d79.pdfIn PDF document text
    • https://radinake.weebly.com/uploads/1/3/1/8/131856095/dejidepotub.pdfIn PDF document text
    • https://buvupoxiku.weebly.com/uploads/1/3/4/3/134329971/f9afb4b262b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410016/normal_5ff7aa20c8136.pdfIn PDF document text
    • https://rujunile.weebly.com/uploads/1/3/2/7/132710621/921c99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368740/normal_5f9ac90173e64.pdfIn PDF document text
    • https://cdn.sqhk.co/xavonepez/jdFGhdJ/34417806417.pdfIn PDF document text
    • https://cdn.sqhk.co/lemipetukaso/Sakho9A/xoduvuvidedivisalufab.pdfIn PDF document text
    • https://cdn.sqhk.co/xezojutatow/fji3PNx/92615337191.pdfIn PDF document text
    • https://cdn.sqhk.co/zejegure/jg3JAgg/fumanubebimifodapo.pdfIn PDF document text
    • https://nekitunanozot.weebly.com/uploads/1/3/5/3/135346928/sifoxezizamovot.pdfIn PDF document text
    • https://cdn.sqhk.co/tuvasovosew/jggghal/dance_classes_for_beginners_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405642/normal_5f9a1260cd1e2.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/nemafu/99470081282.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/fipadapagokomumudazek.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_off0000d476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD476 5032 bytes
SHA-256: e8cccc8adab897fac416d09a4b47d1ec64627a8e3be81ae8d98b64c19d918793
font_01_sfnt_off0000e584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE584 11600 bytes
SHA-256: a361aa03a1daa1f182b5897f1ff2cd422bfcd8ead6ded6b4d879f65de624fead

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