Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c5dfc073bbaddf…

MALICIOUS

PDF

78.2 KB Created: 2021-04-24 01:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b0e766fa0640ca2373b59eb6307bd26 SHA-1: 7a9b84ed2b6d855916521b0af9bf36533a8cfe6a SHA-256: f1c5dfc073bbaddfc6d4c0fb932b5c512c618757a33af55831a754ecf983c0a9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm pointing to various PDF files. One of the primary external URIs, 'https://resalured.ru/strik?utm_term=does+your+ethnicity+affect+your+personality', suggests a phishing or social engineering lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=does+your+ethnicity+affect+your+personality
    • https://cdn.sqhk.co/vajirasavuz/eghhWje/bedingte_formatierung_excel_5_farben.pdf
    • https://tisitijalazog.weebly.com/uploads/1/3/6/0/136017937/3878532.pdf
    • https://jakuxilo.weebly.com/uploads/1/3/4/7/134711712/6a1db358.pdf
    • https://cdn.sqhk.co/gumakulex/fhjihjj/wivuninojexej.pdf
    • http://nawogevimogagu.22web.org/american_pie_2_in_tamil.pdf
    • http://tidajipameme.22web.org/vinojuxov.pdf
    • https://cdn.sqhk.co/kizafizutuw/vWigEge/jofasi.pdf
    • https://cdn.sqhk.co/mugegiduveb/Swbjhhc/43001136026.pdf
    • https://weralafopibobal.weebly.com/uploads/1/3/4/3/134338927/d5bdf5b68b57e.pdf
    • https://fuvogazukipow.weebly.com/uploads/1/3/4/6/134603691/xuxevidoviw-jizajekopakote.pdf
    • https://cdn.sqhk.co/tavolimogid/UgikG3h/lesizupuni.pdf
    • https://basosogufu.weebly.com/uploads/1/3/4/6/134682995/fajopedovos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lezopobigeza/nazara_games_carrom_apk.pdf
    • https://s3.amazonaws.com/waxapoz/ejercicios_con_presente_simple_en_ingles.pdf
    • https://s3.amazonaws.com/wulagisi/36344477247.pdf
    • https://s3.amazonaws.com/rizoli/92859581597.pdf
    • https://s3.amazonaws.com/tutapaxi/70161551269.pdf
    • https://s3.amazonaws.com/lopadivupudexa/zibobikirefaba.pdf
    • https://s3.amazonaws.com/woberiz/vobepobune.pdf
    • https://s3.amazonaws.com/fulosobezur/what_is_landscape_planning.pdf
    • 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_off0000f541.bin
89b9de469765e760f578c49c6a7fb7ab4acaf6e6f8ebce073f59e06c9d11ffdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF541 5204 bytes
font_01_sfnt_off00010705.bin
e32c8d33a7cd1eb3c71598bf44a569d6bc81b043713d899930fb36be42f2b37a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10705 10712 bytes

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