Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e61efd31f1f1ad…

MALICIOUS

PDF

82.3 KB Created: 2021-04-24 03:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5399803a89e461f46d455192a5d8baa4 SHA-1: 1bc09131d39998f41bc0b644e9cd86a0679d9d89 SHA-256: a6e61efd31f1f1add7a6a2bde3606b5961dd6839e6a5f4270eeb895c0069fed5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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://nipisod.ru/strik?utm_term=concepto+del+aprendizaje+basado+en+proyectos PDF link annotation
    • http://towajemikof.iblogger.org/calcium_content_of_foods_chart.pdfIn PDF document text
    • http://mattelipsticks.site/a_streetcar_named_desire_national_theatre_castkudh6.pdfIn PDF document text
    • http://copyright-notice-ig.com/how_to_do_coding_decoding_questionsrty4x.pdfIn PDF document text
    • http://bivasezi.iblogger.org/escala_de_akin_y_rifle.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/mixanaz/zazexapalexikesonejalofit.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/94960909687.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/darovabumoxubenowuwip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/beb4aba1-c9ff-419f-9454-9fe3b2e96914/why_cant_i_get_youtube_on_my_panasonic_tv_anymore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0ef2bf8-b07c-4e0f-b92a-d219fc0fedef/83200633657.pdfIn PDF document text
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_a72f757af82f4b4180b63a25df85f3d9.pdf?index=trueIn PDF document text
    • http://kakogajoxe.epizy.com/fodanogewotew.pdfIn PDF document text
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_250f3cfe28134789af2129e915224b1d.pdf?index=trueIn PDF document text
    • http://zulojazivuvuk.epizy.com/wibijirawalarilojakejete.pdfIn PDF document text
    • http://netozovozuze.rf.gd/plano_cercanias_barcelona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee65c5f5-c6a1-4cea-acbf-4ca3bdfd7c4d/dajonimuk.pdfIn PDF document text
    • http://lojupodinitaxug.epizy.com/commas_in_lists_ks1_worksheet.pdfIn PDF document text
    • https://443275ec-395d-4f86-84c9-2ed7a250e117.filesusr.com/ugd/7d471d_fc84f845109f49749efe943a33e6a242.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/how_much_is_a_stihl_ms290_worth.pdfIn PDF document text
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_fb747cc2fed248ee921032a80a35a1e7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wolawatin/how_to_change_printer_cartridge_brother_mfc_240c.pdfIn PDF document text
    • http://jilevatawew.epizy.com/sword_art_online_game_android_offline.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_off0001009b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009B 5340 bytes
SHA-256: 91797c9f7a55378d526082d6e7d1b5ab77cecc59fda9bad79dae38fb383d7e94
font_01_sfnt_off000112db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DB 11940 bytes
SHA-256: a0d0c47cd8c061dabfecaa58fb36cca8aebafaaed085931bd6e1cb796fc8738b

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