Malicious PDF — malware analysis report

Static analysis result for SHA-256 177426e19112da65…

MALICIOUS

PDF

71.2 KB Created: 2021-04-08 00:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 537c97ed10db8e289a9cab9d4d0887aa SHA-1: ba9b8e93ce0b3fec5e3e0414c415a1afaf0d0ab6 SHA-256: 177426e19112da65759c51700c465c3755b567711d9b4b09d54e0529b0d66d29
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF documents, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

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://ponafet.ru/123?utm_term=csanz+2018+heart+failure+guidelines PDF link annotation
    • https://cdn.sqhk.co/bemapebe/jiEhfV3/68274043939.pdfIn PDF document text
    • http://reduslim-ordina.site/trumpet_music_sheet_for_star_wars1p2b2.pdfIn PDF document text
    • https://cdn.sqhk.co/kapipota/svhbMtb/groove_life_samsung_watch_bands.pdfIn PDF document text
    • https://cdn.sqhk.co/nobegasosev/dROu32a/blackjack_21_endless_free_download_for_pc.pdfIn PDF document text
    • http://rabota-plus.club/personal_pronouns_and_possessive_adjectives_exerciseghvg5.pdfIn PDF document text
    • https://cdn.sqhk.co/fotenulutis/Xahdjhz/checklist_example_excel.pdfIn PDF document text
    • http://beremoter.online/chrome_webview_android_githubsmyx7.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/xazarujokemus/what_does_arabic_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4caa2c7a-b5ca-445b-a9df-fe66093faad8/best_free_editor_cnet.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/what_is_a_atsc_converter_box.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8481cabf-628c-4a4a-b6e0-bf480ea29e02/cuantos_metros_cuadrados_hay_en_una_manzana_de_tierra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fde2c89b-bb9a-44b7-b46e-6ff84147c56f/wintv_24_digit_serial_number.pdfIn PDF document text
    • https://089130c0-62ae-4bf1-a93c-656440fe8451.filesusr.com/ugd/738632_782f5f0121c548239316eed2a75a8b45.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rorives/literature_review_assignment_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/95144659809.pdfIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_0e6bf3f12660452bae9950f7c1297328.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/undertale_megalovania_violin_sheet_music.pdfIn PDF document text
    • https://3778afa4-e5d9-4bb6-be54-d343c89b577b.filesusr.com/ugd/11c894_2d0e694660da472898b50716cbeaed8a.pdf?index=trueIn PDF document text
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_c31d8f1e9ac849d89c3e0c9060970df7.pdf?index=trueIn 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_off0000d8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AA 5644 bytes
SHA-256: 2e6d448327a840e91335bf90ef0bea6e41ee737f44ad98321464df4ef2c3ef5b
font_01_sfnt_off0000ebdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDC 10600 bytes
SHA-256: 4028a9397413ca2ebe35f836aa00121b73afff2b2ed8762d266ac15b8a6f1255

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