Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e73d118b545d766…

MALICIOUS

PDF

72.7 KB Created: 2021-04-02 07:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 956df4e5d0dcee90794e431dd919bd30 SHA-1: e4a9ef7acab419d793a97ac95c9d73baa2fb809a SHA-256: 4e73d118b545d766881bac4f0dd680d0e63b88a3ef7f75b962c195afefe3f1ce
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous external URLs embedded within its structure. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a high volume of links, many hosted on disposable domains, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://gimoguvi.ru/award?keyword=avales+otorgados+pdf PDF link annotation
    • https://kupelaranix.weebly.com/uploads/1/3/4/7/134729830/84253.pdfIn PDF document text
    • https://pawagidi.weebly.com/uploads/1/3/1/1/131164052/dofodu.pdfIn PDF document text
    • https://dazifonawifebi.weebly.com/uploads/1/3/4/7/134763946/2008568.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/pihihql/63416735391.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/20qjsjg/30546356080.pdfIn PDF document text
    • https://mosovokiz.weebly.com/uploads/1/3/4/3/134333023/rokunijizekobasem.pdfIn PDF document text
    • https://cdn.sqhk.co/boguzivipel/jojiFGJ/fapelaxuxuteror.pdfIn PDF document text
    • https://cdn.sqhk.co/wesebewoweva/7jcgjjc/watch_shelter_2007_full_movie_online_free.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/btjijjh/8093398770.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495694/normal_606636279dec7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452385/normal_60224ce7e3d01.pdfIn PDF document text
    • https://cdn.sqhk.co/nokikijun/ViblMhc/85067019516.pdfIn PDF document text
    • https://cdn.sqhk.co/wenegifuteg/TMQihhb/how_to_make_mini_basketball_game_from_cardboard.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwodemo/jhherjh/miwetafafomixanexebuj.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/jbhcieP/funny_friendship_quotes_in_english_for_whatsapp_status.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486748/normal_603ba5f1927e8.pdfIn PDF document text
    • https://cdn.sqhk.co/gemadaruvow/giJ3Mkt/95486762057.pdfIn PDF document text
    • https://duludogom.weebly.com/uploads/1/3/4/6/134673238/pikarimamexajajenafo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/137c787d-efda-4242-a4e3-404012d770a9/nunipakavapex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0c8e312-da56-4f70-a73d-2e590e070ec0/which_is_the_best_portable_oxygen_concentrator.pdfIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_679efcf7848f4f6a97dd65b6ec3ca854.pdf?index=trueIn PDF document text
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_1f935217275d48219280d83fc3612c87.pdf?index=trueIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_048e80a589fb45999dcf3d2faebba751.pdf?index=trueIn PDF document text
    • https://14319df0-7947-4f0d-bbb3-eaa17d5eb23e.filesusr.com/ugd/c45f38_9b8221d7b5684bba83e9fb74c9427bcd.pdf?index=trueIn 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_off0000dfea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEA 5256 bytes
SHA-256: 7cdc53936749ad142c790d3795db08fe3f3ba1918f51fe8e3d8f8cb6c8372947
font_01_sfnt_off0000f1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E0 10976 bytes
SHA-256: 4d4f644d783d59b9dcc3827d160340aacccbc638e00d42df96c0eec0b29e2c53