Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c957bb19a81ad6…

MALICIOUS

PDF

83.9 KB Created: 2021-03-17 14:51:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 71c57fd65cdff4e395ef9b66b3b08235 SHA-1: 4172a42ff1aa5ebd45d3d1e7342087cbaea91266 SHA-256: a7c957bb19a81ad6f8b0b3c06cd4e655fd3941c6ed008bb4b698fa71ea5abfde
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains keywords related to search results and potentially lures.

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://dugedepap.ru/wix?keyword=school+choice+maine PDF link annotation
    • http://zoompol.xyz/stone_soup_cottage_deliveryctfpt.pdfIn PDF document text
    • http://vostokzapad.su/best_english_story_books_free_downloadbavwc.pdfIn PDF document text
    • http://fakurivevid.scienceontheweb.net/how_to_cook_rainbow_trout_in_a_pan.pdfIn PDF document text
    • http://medilawibume.scienceontheweb.net/rutazufewim.pdfIn PDF document text
    • http://study-english-04.space/towivuzewajepatifidenx4tz2.pdfIn PDF document text
    • https://cdn.sqhk.co/safubuguva/Oos4jh9/new_gangster_crime_mod_apk_obb.pdfIn PDF document text
    • http://gubixazolela.sportsontheweb.net/game_of_thrones_s8_download_reddit.pdfIn PDF document text
    • http://ketenimolupev.sportsontheweb.net/71626511128.pdfIn PDF document text
    • https://cdn.sqhk.co/bapulofuw/jjdjiib/vitamin_d3_vs_d5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://91506351-5699-48ce-85e7-8e7d071f4e87.filesusr.com/ugd/d775a9_400c4f85767c4c27b1fffac44c1ae8a0.pdf?index=trueIn PDF document text
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_23487197c13f46a3a1b80bdf106920c8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/measuring_angles_worksheet_answer_key_geometry.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/74306232781.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/aws_cloud_practitioner_exam_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/how_to_reset_a_netgear_switch.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/vomewu.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/52846590354.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/algebra_1_student_workbook_answers.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_off00010c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C73 4868 bytes
SHA-256: b4d169388fa18222fc30f229b116635c0fa1ff78a4b7a629a5e871c1cee8261f
font_01_sfnt_off00011cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD9 11204 bytes
SHA-256: 43bd5aef81e376119b0bbb4677bcf3bd09f15b26ffd30d6cc59cd5067572641f

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