Malicious PDF — malware analysis report

Static analysis result for SHA-256 881f4bbf44a0c101…

MALICIOUS

PDF

70.5 KB Created: 2021-02-22 05:17:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 2916a84c02104a3db772908adcad4269 SHA-1: d8b02a684089ca99809abb254179c0e3e68cf975 SHA-256: 881f4bbf44a0c1014c18297a3d65a3e3c58ac237ec6295bf3ef9a435905b759f
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to a URL that appears to be a lure for worksheet answers. This link is the primary indicator of malicious intent, likely leading to a phishing or malware download site. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/wix?keyword=america+the+story+of+us+rebels+worksheet+pdf+answers In PDF document text
    • https://static.s123-cdn-static.com/uploads/4403140/normal_5fe1c12bb6ebe.pdfIn PDF document text
    • http://joy-todays.online/54293980033kqi5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374371/normal_6018e8a510fa4.pdfIn PDF document text
    • http://websporizlehd.com/wvu_mine_rescue_teamodksx.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/neviwove/56941669954.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/identifying_proper_and_improper_fractions_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/jaduberogeraf.pdfIn PDF document text
    • http://zefobik.epizy.com/71413207153.pdfIn PDF document text
    • http://tinuzutajalik.epizy.com/sowofo.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/great_ocean_road_self_guided_walking_tours.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/hibiscus_petroleum_berhad_annual_report_2014.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/zujuxesuvitimera.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/resumen_el_conde_lucanor_por_cuentos.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC00D 5784 bytes
SHA-256: ae4751d7d977c0834c0246bb4c7754d6e103699d1d8daf3a6e85101e6bd61c4f
font_01_sfnt_off0000d3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A5 10388 bytes
SHA-256: 5b996eb2451bd7c39173189c1799262f7714ea03aceffaed63aeb52c6c51f15c
font_02_sfnt_off0000f77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77D 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848

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