Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d60df149e9e38a4…

MALICIOUS

PDF

82.3 KB Created: 2021-03-26 07:46:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: acb5f86764d6513f626e4fdfcbb1c006 SHA-1: 15f7c824daa6e970104adabcd5fd586d2765682d SHA-256: 1d60df149e9e38a4d870e71deda65417850c261d5efabf8ba71ccc6ac7870da0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and likely phishing-related. It contains a large number of external links, characteristic of a link farm, with one prominent URL being https://resalured.ru/strik?utm_term=is+nasm+cpt+exam+open+book. The document body, though heavily obfuscated, suggests a lure related to an 'exam open book' scenario.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/strik?utm_term=is+nasm+cpt+exam+open+book PDF link annotation
    • https://cdn.sqhk.co/noxibogalu/icjfiju/lekipumekuxekino.pdfIn PDF document text
    • https://cdn.sqhk.co/fodibaniwe/jbsFigJ/furniture_store_hubbard_oregon.pdfIn PDF document text
    • https://cdn.sqhk.co/gimiraxu/ihhhhwg/43201503179.pdfIn PDF document text
    • https://cdn.sqhk.co/xozakatupab/Jge3ojL/causes_of_the_civil_war_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/bamikalagov/gd86pa6/daily_behavior_checklist_for_autistic_students.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/Kigtgce/recargar_celular_claro_en_linea_colombia.pdfIn PDF document text
    • https://cdn.sqhk.co/kigowabalo/fgche4u/gexurori.pdfIn PDF document text
    • https://cdn.sqhk.co/bivosemubo/W4Nhbjg/70975792688.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/kukupunopedon/rorefiselumurizomel.pdfIn PDF document text
    • https://6998e30b-c911-4113-ab34-4c15204891c7.filesusr.com/ugd/429b25_e3efa87e8fff4814a65de021c8c98679.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/kolatuvig.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/nuxejiteroremugiruxuzid.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/shoot_em_up_full_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/13070629426.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/android_adb_logcat_filter_by_application.pdfIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_c5c2f90296b14811895c81340cca8066.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ginutu/how_much_does_it_cost_to_start_a_car_dealership.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/cooking_academy_2_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/voucher_format_in_excel_free.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/16874496846.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/98034232504.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_off00010515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10515 5160 bytes
SHA-256: b729acf0a7bba7640721a7ec53c84cf86113656f18febe1053084a4bca34a9ea
font_01_sfnt_off00011698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11698 10876 bytes
SHA-256: ec2fc991251439fd84a958c6068518d82dda7390e97a9d40bd0a3a1a0b889317

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