Malicious PDF — malware analysis report

Static analysis result for SHA-256 897d862aedf36801…

MALICIOUS

PDF

84.4 KB Created: 2021-03-16 21:59:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51386f02754cdd3bba04de0dc4a918db SHA-1: dbae69dd6c7c520b67f3f8a6b4c467aabaf5df8b SHA-256: 897d862aedf36801d350ec88fb27b5c75e27739ec7cc4c2bc347724416bef598
126 Risk Score

Malware Insights

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

The file is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this purpose. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which could be used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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
  • 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://dafemum.ru/123?utm_term=overwatch+lucio+competitive+guide
    • https://cdn-cms.f-static.net/uploads/4453888/normal_6037fac92c4bf.pdf
    • http://localdesign.me/tap_dancing_to_work_reviewvkeay.pdf
    • http://trastqort.online/zafopozesojory71fp.pdf
    • http://bristol-yalta.run/jopofujivoravubitudcrky.pdf
    • http://bigpleasure.ru/fewozibepofimemf4ufo.pdf
    • http://babysampler.com/utorrent_free_download_hindi_movies5f83o.pdf
    • https://cdn-cms.f-static.net/uploads/4381737/normal_601f71e8510b7.pdf
    • https://static.s123-cdn-static.com/uploads/4402711/normal_5ff0670a986ec.pdf
    • http://zalavsky.ru/convertidor_de_youtube_a_mp3_xd_gratisx5b1d.pdf
    • http://salonapp.xyz/homelite_electric_weed_wacker_wont_startpp110.pdf
    • https://cdn-cms.f-static.net/uploads/4388428/normal_60194d795b4a2.pdf
    • https://static.s123-cdn-static.com/uploads/4422918/normal_5ff262c761a1f.pdf
    • http://appless.space/95221865042p72a1.pdf
    • http://glawerry.online/callapp_premium_apk_free26coa.pdf
    • http://top-odejda.com/wajisepujzx25z.pdf
    • https://static.s123-cdn-static.com/uploads/4452624/normal_600124913c3bb.pdf
    • https://static.s123-cdn-static.com/uploads/4470542/normal_5fefe15c598b0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/matogapibelifiv/data_structures_cheat_sheet_python.pdf
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_b87e0e82f9bf4c35991d4af7b66a8b91.pdf?index=true
    • https://s3.amazonaws.com/zeworibuzoza/s_a_d_o_ka_full_form.pdf
    • https://s3.amazonaws.com/liguwubore/java_for_mac_64_bit.pdf
    • https://s3.amazonaws.com/jadudusujuje/60128237422.pdf
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_09372d4e493240a4a2f5b5d07491a52d.pdf?index=true
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_a5006bb2e12a4f9eb894acb120b71490.pdf?index=true
    • https://s3.amazonaws.com/tigewibejageju/64827820890.pdf
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_83aca99551ff41f590fec8ac07f6c4b6.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b87.bin
c5b224197a36c1dbd7190af335387cb687acc9585aee88cfdbf456606fdf5dc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B87 5488 bytes
font_01_sfnt_off00011e1d.bin
1476a1d60f53901c270a2cdf5aeb13ef6cc81c1361422be72ed5b82fd9fe6ecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1D 10680 bytes

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