Malicious PDF — malware analysis report

Static analysis result for SHA-256 e086bcf4f5c3d190…

MALICIOUS

PDF

85.6 KB Created: 2021-03-30 17:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9b83731a9d6d6930c4c9d1b18193cdcb SHA-1: b16168edb72e1bb0e359fe4397b651dbddb36fff SHA-256: e086bcf4f5c3d190c7f575448b78ec2aa7378532b899e6e870ccbbfbc5ba51ac
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 0.9995

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
  • 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://golowaki.ru/award?keyword=essential+mathematics+for+economics+and+business+bradley+pdf PDF link annotation
    • http://wofirulufe.iblogger.org/zadajiminowu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://48bf584d-d56c-45cf-b4f3-c1c05dce5274.filesusr.com/ugd/3f4b99_4e1dd13dd52743bea33a8de0842e7b66.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8548551f-25c6-4c07-acc6-eacb558bf3c1/inheritance_cycle_book_4_audiobook.pdfIn PDF document text
    • http://vavijirodujozi.rf.gd/6001236878.pdfIn PDF document text
    • http://volisaberok.rf.gd/77238976091.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/cantonese_opera_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/51417479902.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/dresses_for_formal_wedding_plus_size.pdfIn PDF document text
    • http://fudogupadi.rf.gd/fuwiwebapajuwapinav.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/tefidujotejur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b988755b-fda0-4a96-95e5-2e6410e49624/ferurosulurinigo.pdfIn PDF document text
    • https://s3.amazonaws.com/wupuxus/houghton_mifflin_harcourt_answer_key_grade_8.pdfIn PDF document text
    • http://toxabose.epizy.com/scott_cunningham_books_in_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b291b054-e8fb-47ba-8eb0-620c959a4a05/what_is_the_best_nasb_bible.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/bausch_and_lomb_keratometer_manual.pdfIn PDF document text
    • http://pejinubonuxus.epizy.com/how_do_i_reset_my_vtech_answering_machine.pdfIn PDF document text
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_b3f9acb86d9e42d3a9fa2051a5bbcb16.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fixararololu/creative_cloud_apps_direkt_2019.pdfIn PDF document text
    • http://sezigan.epizy.com/80979416708.pdfIn PDF document text
    • https://f856bbc4-01c8-45e4-8891-a53c5ee59fd0.filesusr.com/ugd/8e827e_ae00b4cf4e06442e88f1b0c478d0a4ec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gumagabu/maid_of_honour_wedding_speech_template.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/19609759446.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_off000110a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A0 5596 bytes
SHA-256: f676f559adc12695917f9de3ad8e63b03d7c16a30f73933c22928eaf22707c7d
font_01_sfnt_off00012382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12382 10828 bytes
SHA-256: d835122ab29c60b94051e10c5a820bc8e4c8b71bac01eadcad6702471dbb4bf5

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