Malicious PDF — malware analysis report

Static analysis result for SHA-256 91dfcdaa49d43294…

MALICIOUS

PDF

73.1 KB Created: 2021-06-09 13:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0c95c9a07be3892618c9acf06856e9de SHA-1: e7919d78e88a6d72c7c7c098d5650198f8f317ba SHA-256: 91dfcdaa49d4329488d03edd82a48a836f1181995c19e1a53b2134c1d57a672a
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a website disguised as a worksheet with answers, which is a common phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of an external URI and the overall classification suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/pbw?utm_term=net+ionic+equations+worksheet+pdf+with+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387035/normal_6016d2e7244e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365626/normal_5ff313ba869d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469106/normal_601ddf3ee6e8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405184/normal_602ab05f7d329.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447450/normal_5fd2534ebf9b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390996/normal_601e7cbbeb99d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445749/normal_5ffb3a9b17f88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495854/normal_5fe91da922793.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450896/normal_5ff21ecd92524.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375203/normal_6057affcda8c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450630/normal_5fec9270cddb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411683/normal_60661bce2a1b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409405/normal_60219a645e462.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379384/normal_6044d46365dbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419236/normal_602634a6122c3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/9eda539b-8917-4600-8507-34be99f03332/rusemefelewexutorojivex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/089dc0d2-e7b0-4292-89a1-e61a9df5a697/2008_jeep_wrangler_unlimited_rubicon_lift_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60b313bf-8912-40a8-b433-acccd959a4c4/35603379136.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a16b3e5-b843-4546-957c-e34f12afd7fb/94340463693.pdfIn PDF document text
    • http://vuvikix.pbworks.com/f/amor_eterno_novela_turca_capitulos_completos_en_espaol_capitulo_217.pdfIn PDF document text
    • http://jifesepapo.pbworks.com/w/file/fetch/144879522/telugu_chandamama_kathalu_books_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C3 5344 bytes
SHA-256: d6a737f48139bbc339cad09ea5839a2c7779dc6c88fa4b82b1c07791d74360ac
font_01_sfnt_off0000e2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FD 10948 bytes
SHA-256: cdf36a172f795513669be4b2c567804fe75057aff8d3e58498b79edfd3812ee2
font_02_sfnt_off00010837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10837 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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