Malicious PDF — malware analysis report

Static analysis result for SHA-256 842a5c02bd744a4b…

MALICIOUS

PDF

70.1 KB Created: 2021-03-05 00:12:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 895e53c2663b014786fc31db478c9fa4 SHA-1: 9be890072710574aeede0c1bfbdb92ec8d966775 SHA-256: 842a5c02bd744a4bf309ba2264cefdf855968070fc5b34537fab0e522c0fa5e5
196 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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/strik?utm_term=matematicas+iv+algebra+lineal+ron+larson+pdf+gratis PDF link annotation
    • http://itchia.space/how_to_give_gratitude8dc16.pdfIn PDF document text
    • http://emmetrix.net/98925845289a1v4w.pdfIn PDF document text
    • http://riwotivadejud.sportsontheweb.net/kawomugoki.pdfIn PDF document text
    • http://fringigejy.site/nifosowusirapec4h6q.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/3._what_is_the_central_theme_of_the_poem_the_road_not_taken.pdfIn PDF document text
    • http://robugipunebib.mygamesonline.org/logitech_wireless_keyboard_k400_receiver.pdfIn PDF document text
    • http://com-login8.xyz/translating_word_problems_into_equations_worksheet_with_answers601y4.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/vikari.pdfIn PDF document text
    • http://tofotibuwul.sportsontheweb.net/16259930627.pdfIn PDF document text
    • http://taforojujutusig.mygamesonline.org/descargar_musica_anthony_santo_en_vivo.pdfIn PDF document text
    • http://apelsins.space/muwijo9ssst.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_4f07d94d4e70458685d070179d08f006.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/56082427438.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/reformed_baptist_seminary_kentucky.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/idiot_s_guide_to_spanish_verbs.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/29699184838.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/setool_box_usb_serial_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/phonak_brio_2_user_guide.pdfIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_67024ac2f06b41e5a6768aea405ac881.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_off0000d3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A7 5680 bytes
SHA-256: c30dad827f3243984c05f70d427322b9d366203d541fb953addfbf56536b5505
font_01_sfnt_off0000e6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F5 10500 bytes
SHA-256: f17ce15a3ed2b4f08b1038259758bcb98d4d958a4646c127074f5b40f4d81fed

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