Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a1c6cbfb0baeda0…

MALICIOUS

PDF

76.3 KB Created: 2021-03-01 07:31:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 819d69540cdd39e426b8ee7761db9425 SHA-1: 1b3f2139029bbd1d5281a8233bd88acb0103d9e2 SHA-256: 1a1c6cbfb0baeda09e81d55b9f0d91f8d49368989a2f55255fe04ff2b6a18e0c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. These links point to various domains, suggesting a coordinated effort to redirect users to potentially malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://maypoin.ru/aws?utm_term=beats+by+dre+car+audio+system PDF link annotation
    • http://mif-smeh.space/ponanevinagolarabedptlpy.pdfIn PDF document text
    • https://cdn.sqhk.co/lovuzegonu/nkjhggT/hotel_transylvania_hotel_havoc.pdfIn PDF document text
    • https://cdn.sqhk.co/pivatiwon/hbibI5K/dancing_on_my_own_roblox_song_id.pdfIn PDF document text
    • https://raguloduw.weebly.com/uploads/1/3/4/0/134041620/xemuzizawamolefu.pdfIn PDF document text
    • https://cdn.sqhk.co/jagibuvat/jgQ5itA/encyclopedia_britannica_online_search.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469849/normal_5ff8212eca19b.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/e1hgNgg/cowboy_bebop_netflix_release.pdfIn PDF document text
    • https://cdn.sqhk.co/wazuzofi/jbpjbic/sileloripu.pdfIn PDF document text
    • https://zepusarogetiki.weebly.com/uploads/1/3/4/6/134687077/jixegu.pdfIn PDF document text
    • http://vienvozvrat.site/remidorazuwapigebb1es.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/AL5QjiP/58269884024.pdfIn PDF document text
    • http://fredo.bike/best_car_for_city_driving_202075ggj.pdfIn PDF document text
    • https://javekekowunafot.weebly.com/uploads/1/3/5/3/135324960/9aaecedba7261c3.pdfIn PDF document text
    • https://cdn.sqhk.co/kumotuxijufu/jbtvjcI/blaze_and_the_monster_machines_fancy_dress.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370746/normal_6016c2969153a.pdfIn PDF document text
    • http://kittyplay.online/bubagujajesajegitumoriro6z4su.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455684/normal_60195643a605c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ecf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF4 5344 bytes
SHA-256: 78cddbb333088a0f8b065898b6ba63836320b57a2bb4836908707ce50c8cb871
font_01_sfnt_off0000ff0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0A 10776 bytes
SHA-256: f467ab19c5d6f80ce39f9aa53f3a46cdbaff085e5549ee988699fc87261308a9

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