Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f78c1391ca4418…

MALICIOUS

PDF

77.0 KB Created: 2021-03-28 15:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: da1fa4bb2ef14a4f1fdd01d9c3db2ecf SHA-1: 20414e0446428f3b5c0ea8aebc912bd3d540f686 SHA-256: 79f78c1391ca4418836d21123f4f7eeed27bde9a5438044cce0e08643f66c8c1
136 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure, specifically using an SEO redirector to promote a game mod download. The embedded URL `https://ponafet.ru/wix?keyword=tetris+blitz+mod+apk+latest+version` is a key indicator of this malicious intent. ClamAV also detected this file as `Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0`, further confirming its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://ponafet.ru/wix?keyword=tetris+blitz+mod+apk+latest+version PDF link annotation
    • http://kengoru.space/xafumutovavuvukokakofuvi8g15z.pdfIn PDF document text
    • http://vasizazesunof.medianewsonline.com/duwuku.pdfIn PDF document text
    • http://zijozarub.mygamesonline.org/wozosinugop.pdfIn PDF document text
    • http://dajexori.mypressonline.com/best_free_star_chart.pdfIn PDF document text
    • http://zonojebiridizo.mywebcommunity.org/3679984648.pdfIn PDF document text
    • http://busforpay.online/alfabeto_para_imprimir_y_recortarknwl2.pdfIn PDF document text
    • http://meetly.space/boyles_anaesthetic_machinegiz06.pdfIn PDF document text
    • http://ita-women.space/daddy_s_goodnight_kiss_guide9kf3r.pdfIn PDF document text
    • http://tonedomopoja.scienceontheweb.net/krups_nespresso_coffee_machine_spare_parts.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xarilupinedup.myartsonline.com/kikazaxoraxovuvelunipi.pdfIn PDF document text
    • http://jujiruwer.rf.gd/podusokuwed.pdfIn PDF document text
    • https://2d2b1dae-c014-4902-97e6-c3f1d56915cd.filesusr.com/ugd/70e5f7_19440a8bfdb042e0974783b6da3bb38a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/how_to_arch_text_in_vinylmaster_cut_4.0.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/93616046385.pdfIn PDF document text
    • http://kojuvurapamox.myartsonline.com/ludawezojusojiluf.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/texezovevarudunujigodalas.pdfIn PDF document text
    • http://paporoj.rf.gd/gugerelakoradoxeliwakorut.pdfIn PDF document text
    • http://zupizuzopet.rf.gd/epitelio_celmico.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/how_to_connect_logitech_z623_to_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/61435118450.pdfIn PDF document text
    • http://rojapaj.epizy.com/gambling_addiction_treatment_worksheets.pdfIn PDF document text
    • https://11e0ccb5-01dd-4757-ae93-f6f3b4f5ca32.filesusr.com/ugd/1a2ce6_e0915ebea82c4a76b30c5ff3383ff286.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_off0000ec98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC98 5368 bytes
SHA-256: 0f602b61ffd2afead570e6bff7a86511b38994295d1ca62d9b082154fc0fef06
font_01_sfnt_off0000fec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC7 11752 bytes
SHA-256: 19b0ea5891c2bd7704cc40bb86af9704809f6be2a5de7d2e738c2a382956e150