Malicious PDF — malware analysis report

Static analysis result for SHA-256 7215b4b11eff8356…

MALICIOUS

PDF

68.6 KB Created: 2021-02-22 10:50:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 404c8478c4d14dbe8b20c3d38aea9710 SHA-1: b3308636626ee20874fd819809f0f473a4713734 SHA-256: 7215b4b11eff8356992ac985315c7d2fe0787ef6ada59e07762875ddeb02c776
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of a PDF_SEO_LINK_FARM heuristic suggests the document is designed to host numerous external links, with one prominent link pointing to a keyword-laden download page. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics suggest it may leverage embedded JavaScript or other PDF-specific exploits to facilitate the download of further payloads or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://baarspo.ru/wix?keyword=zombie+tsunami+apk+download PDF link annotation
    • https://kegozogoro.weebly.com/uploads/1/3/4/5/134525602/f80a20ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416675/normal_60160b8c3728b.pdfIn PDF document text
    • https://modibidusez.weebly.com/uploads/1/3/4/0/134096811/zalifova-verarekafisop-vogako-fazidodisataga.pdfIn PDF document text
    • https://vazanopika.weebly.com/uploads/1/3/4/8/134896022/zefejigusalil.pdfIn PDF document text
    • https://werijininen.weebly.com/uploads/1/3/4/6/134635560/tazemuduwojuzed_dekafosibo_giloxesamu.pdfIn PDF document text
    • https://nitevafatuva.weebly.com/uploads/1/3/4/8/134872456/benofegupipune_mejara_voxozawikuka_nebujawu.pdfIn PDF document text
    • http://vefaporuzudu.iblogger.org/fororiregifot.pdfIn PDF document text
    • https://nefarixuk.weebly.com/uploads/1/3/1/4/131407944/43f8b9.pdfIn PDF document text
    • http://rujakagixawimir.22web.org/top_online_games_android_2018.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/wuzalugiseto/38967106760.pdfIn PDF document text
    • http://vafukibugaf.epizy.com/icc_commercial_building_inspector_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/78385657228.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/42021239548.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/bapax.pdfIn PDF document text
    • http://piralulowos.rf.gd/ppt_diagram_templates.pdfIn PDF document text
    • http://jometuxinuvalal.epizy.com/nice_guidelines_ruptured_ectopic_pregnancy.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/yahoo_mail_app_for_iphone.pdfIn PDF document text
    • http://xivubijorudi.epizy.com/drum_sheet_music_for_christian_songs.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_off0000cfcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCF 5260 bytes
SHA-256: 873aa6a707af12af4b32583c3cbe057495c3dc619d60e4a2a5a24cac2ea6e3a4
font_01_sfnt_off0000e1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B1 10312 bytes
SHA-256: c630721df33e314d1b84fd7453eba4c0a6cb3bd94cf8053480ebe56ceccc9079

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