Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a444fee54fc2f1d…

MALICIOUS

PDF

77.8 KB Created: 2021-03-14 20:28:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 843583d9082509b941fd1543d3095ed0 SHA-1: 71297533e9dd8af40cdc4cd11795d6e665a6855d SHA-256: 7a444fee54fc2f1d3455a88898d3dabf641f8b85447bcacff94a94d69a4328f9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The PDF contains a large number of external links, suggesting it's part of an SEO link farm designed to redirect users to potentially malicious sites. The primary suspicious URL identified is https://jumiwimov.ru/strik. While no scripts were explicitly extracted, the PDF structure and link farm heuristic strongly suggest an intent to redirect users for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/strik?utm_term=why+did+dracula+choose+lucy PDF link annotation
    • https://cdn.sqhk.co/dodamewope/0heEipT/poptopia_2019_sap_center.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/gQYsYWw/game_center_apple_iphone_8.pdfIn PDF document text
    • https://cdn.sqhk.co/wejuladuke/2ojjGjd/nonumojuwo.pdfIn PDF document text
    • http://xasujaru.22web.org/wadizibakekirunigujo.pdfIn PDF document text
    • https://cdn.sqhk.co/teforoke/Rqjj7B7/lock_screen_ios_14.pdfIn PDF document text
    • http://wowuzarupi.iblogger.org/clown_music_sheet_music.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/fotepopunaj/kaththi_theme_music_ringtone_masstamilan.pdfIn PDF document text
    • http://tizafuj.epizy.com/jasabamagorefejuxofelif.pdfIn PDF document text
    • http://zofududa.rf.gd/desuxuxadomijafatufur.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/vomuzoxosurajenidilux.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/chirkut_band_songs_free.pdfIn PDF document text
    • https://74a5c9af-61bb-4d76-9351-4d02c0bf652a.filesusr.com/ugd/e33828_6d340399eb90431e84f560bb549e534c.pdf?index=trueIn PDF document text
    • https://37628037-8ed2-4234-80bf-d3204aa213b5.filesusr.com/ugd/c4dbd3_712473fc71444d9bb82bfbecaaae9fff.pdf?index=trueIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_e2eded64191843609ac36b4919e33778.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/commas_dashes_and_ellipses_worksheet.pdfIn PDF document text
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_209e1531eb6843efb0583e3ab754c3c2.pdf?index=trueIn PDF document text
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_09c492b53c49445284bad9634b1acf12.pdf?index=trueIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_833c0a9dbba446e89dcf98d93ee7c069.pdf?index=trueIn PDF document text
    • http://nawopezor.rf.gd/sadapulomuwukegubukuz.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/pigoguditewekixiweju.pdfIn PDF document text
    • https://1b2c4efd-c8eb-4b04-b26f-b9154d704720.filesusr.com/ugd/d3758e_fb81820874f743b593a27ccdf6738763.pdf?index=trueIn PDF document text
    • https://01d67eed-50ba-4ccb-8f82-c1581f7ed07e.filesusr.com/ugd/e3325f_926079dcc970440dbb2e1a12461bb0a8.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_off0000f38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38A 5144 bytes
SHA-256: 665cd8e0ecc723dd093411ea4f53979578f1821ec64d5431e2487f6344924c0c
font_01_sfnt_off00010513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10513 11172 bytes
SHA-256: 1ba4aa343cc203c84c366ac7b2a470e86958c3ee735fccbd0e2a30ff6349eb8b

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