Malicious PDF — malware analysis report

Static analysis result for SHA-256 0253ce5ee298dae7…

MALICIOUS

PDF

81.3 KB Created: 2021-02-17 00:40:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f0653391f9f05b48431ae64dfa23a192 SHA-1: ef5256b4f071c49ec6ccda72988a37b4bbe70e56 SHA-256: 0253ce5ee298dae7e8d0c3414ca4ad71c0b20eee568a714b6f278d75db302b60
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector and others forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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.
  • 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=16.4+evidence+of+evolution+answers In PDF document text
    • https://pejegenipejixe.weebly.com/uploads/1/3/4/8/134848799/80e2a6.pdfIn PDF document text
    • https://sazulolako.weebly.com/uploads/1/3/1/4/131453808/tavaguzaweva.pdfIn PDF document text
    • https://dovenegipejapu.weebly.com/uploads/1/3/0/7/130740438/54786f.pdfIn PDF document text
    • https://resuzomesidi.weebly.com/uploads/1/3/4/7/134746605/zuzigovamalixujixik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://litufowanukoro.epizy.com/nuxipidokusamudanaperajix.pdfIn PDF document text
    • http://femodizabofowu.epizy.com/appointment_letter_format_for_marketing_consultant.pdfIn PDF document text
    • http://tunawibiga.rf.gd/bloons_td_battles_5_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/katotidavikopoliwidu.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/lomatulokelelejozotog.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/management_science_and_engineering_degree_undergraduate.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/11130816391.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/zobufewoxasiri.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/kinemaster_video_editor_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/activity_sheet_for_letter_g.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/gatifinebatupupa.pdfIn PDF document text
    • http://mekuroxowu.epizy.com/lamibe.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_off000100b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B4 5400 bytes
SHA-256: fe603991a0fc3ef52e31ce3eba075a01ee1440359700b02a389b939bf556eca1
font_01_sfnt_off00011348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11348 10840 bytes
SHA-256: 461cb2870e9bfc6a54dc884ed5acbed1c842e5aa592a7fa6ff38fdaadf748c6a

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