Malicious PDF — malware analysis report

Static analysis result for SHA-256 97e9cb87067ae67e…

MALICIOUS

PDF

90.0 KB Created: 2021-02-25 13:54:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 55bbbf1fd6e7774cdeab0ba8f18c544b SHA-1: 3dd5cad31fc9bc2fa67495d77a03dc2563f9cce7 SHA-256: 97e9cb87067ae67ef2e29de77dad2d08814affb4f09750fd739509832cf222e6
192 Risk Score

Malware Insights

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

This PDF file is flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The presence of a 'download button' lure and the embedded URL pointing to a potentially malicious redirector suggest an attempt to trick the user into downloading a payload. While no scripts were directly extracted, the PDF structure and malicious links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=bullet+force+apk+offline In PDF document text
    • https://static.s123-cdn-static.com/uploads/4481156/normal_5fcebe6c38161.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403820/normal_602c5c4fc7769.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465025/normal_6036e197c0774.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412160/normal_600326c745017.pdfIn PDF document text
    • https://wemawamirake.weebly.com/uploads/1/3/5/9/135959397/vutokisunefuritobe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413848/normal_6025f26c6deae.pdfIn PDF document text
    • http://zikuwojanubeg.iblogger.org/passport_renewal_forms_near_me.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/sajezife/23138446502.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/shanghai_fosun_pharmaceutical_group_annual_report.pdfIn PDF document text
    • http://ligoroxenafof.atwebpages.com/2467749748.pdfIn PDF document text
    • http://vedegisawopuf.epizy.com/toefl_test_sample_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/xititekemam.pdfIn PDF document text
    • http://ziwemasux.myartsonline.com/13960007068.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000125ef.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x125EF 29344 bytes
SHA-256: 97cc5bc0b3efb7bd7a7b96f3d6fdf79967731e51aea8f0e02dd57c4f08a21385
font_00_sfnt_off0000f0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B9 4944 bytes
SHA-256: 9b2229452384c5d6f1d9acd3442c95b1d47f112a9589cde3d230bf55290e51de
font_01_sfnt_off000101a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A3 10792 bytes
SHA-256: 10e89419e6e636f29190c506e3e692526866564623ae60cde255087002932fab

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