Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3fc0ca873edc24d…

MALICIOUS

PDF

91.3 KB Created: 2021-03-30 17:40:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f691b48ff9ed683c976269c8c0ccfecb SHA-1: 24bab44a607316b75df69fe718737fb048fcec5f SHA-256: c3fc0ca873edc24df9cbfa6980d3994e82428b15ae54986f4cbb1d9420a021a3
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 0.9998

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://dafemum.ru/123?utm_term=bitdefender+antivirus+apk+full PDF link annotation
    • https://dodarumobite.weebly.com/uploads/1/3/1/4/131437296/wenepazatolenezeje.pdfIn PDF document text
    • https://jivudajen.weebly.com/uploads/1/3/4/4/134470456/233b4184.pdfIn PDF document text
    • https://cdn.sqhk.co/wisivelu/fhdheie/25708016538.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/cdgibq5/note_making_examples.pdfIn PDF document text
    • http://lozutapezu.iblogger.org/infosys_online_aptitude_test_questions_and_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/fagijopi/SURGiaJ/touch_the_monkey_song_2020.pdfIn PDF document text
    • http://kuvurewe.22web.org/anova_precision_cooker_user_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/pefapalotux/gUia15O/76551367014.pdfIn PDF document text
    • https://cdn.sqhk.co/fakupavod/k14gWuS/jasuvajutopinofenut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/65f53da0-d4d4-4409-b246-d2b37dd7a18e/list_of_jiu_jitsu_moves.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a63e91d-fc3c-4c43-abd2-160ae1fd6dde/how_to_make_a_bar_chart_in_excel_with_one_column_of_data.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71970eca-2c51-40a5-90e4-897e9b4f2938/how_to_use_left_formula_in_excel_for_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/063359ef-ecd2-4877-b9d1-61353d8e5060/aston_martin_dbx_for_sale_dubai.pdfIn PDF document text
    • http://gijaguvid.rf.gd/telugu_private_love_songs_ringtones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88240c74-ba46-412b-a32e-eb8b91fe8224/creative_writing_topics_for_grade_2.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_off000129c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C3 5208 bytes
SHA-256: 7f487cede9c3895b33a68169b413220a894120147526b2e76f0004b6d7650489
font_01_sfnt_off00013b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B95 10904 bytes
SHA-256: 52528a450eac3952cb04799799ad5ef992e954a3912591b6eb543455d246f7f0

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