Malicious PDF — malware analysis report

Static analysis result for SHA-256 52792af841178d11…

MALICIOUS

PDF

74.3 KB Created: 2021-03-12 11:45:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 5feac8f95fa6ad2af10c445e1adf2bf9 SHA-1: 500e1e8523bde6dd0d51950620e12d314deb8fda SHA-256: 52792af841178d1198713a46ecf47a096fb9ceb855808edceb854460fdb9b0ee
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/award?keyword=basketball+basic+rules+and+regulations+pdf PDF link annotation
    • https://cdn.sqhk.co/fozozumaj/jagfCJF/78541271000.pdfIn PDF document text
    • https://cdn.sqhk.co/filodomazora/ahaTzNR/9007575601.pdfIn PDF document text
    • http://taforojujutusig.mygamesonline.org/troy_bilt_lawn_mower_belt_replacement.pdfIn PDF document text
    • http://javaxirivibewi.mygamesonline.org/where_can_i_find_the_dice_game_left_right_center.pdfIn PDF document text
    • http://movawizaxaxato.mywebcommunity.org/sunbeam_heated_blanket_directions.pdfIn PDF document text
    • http://vijevejumozugim.sportsontheweb.net/saxitotufozoxikojowapugi.pdfIn PDF document text
    • http://zeruxejobimal.mywebcommunity.org/how_to_write_a_professional_resume_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/wesuwajil/bgdKRP6/nagujemimofiwis.pdfIn PDF document text
    • https://cdn.sqhk.co/nutakurij/RKgeJd3/save_the_fish_game_free_online.pdfIn PDF document text
    • http://xafopawiki.medianewsonline.com/42525865534.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/jjeYkgM/skylanders_superchargers_portal.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/bjfggxy/free_qr_barcode_scanner_app.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_8fdd822ab30f43cc8287503a4556ed74.pdf?index=trueIn PDF document text
    • https://c33c3ce4-fa2f-4f19-9477-7a801b41b29e.filesusr.com/ugd/ebbcbd_400b0bf227c24574af9cb24ea5a40dcc.pdf?index=trueIn PDF document text
    • http://minivenema.atwebpages.com/10630222304.pdfIn PDF document text
    • http://refusunono.onlinewebshop.net/raluf.pdfIn PDF document text
    • http://namakanexir.atwebpages.com/pathfinder_adventure_card_game_wiki.pdfIn PDF document text
    • http://segurixuzek.myartsonline.com/26526269115.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_off0000e74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74E 5576 bytes
SHA-256: 79211aff6311ee4e0dce3e86c6a146b37a2064d88d4c48f9034905b5ac801850
font_01_sfnt_off0000fa50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA50 9916 bytes
SHA-256: 1ab42351e66b9fbec089c761355705bdfab7be68c379eeef6d15540c54147038

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