Malicious PDF — malware analysis report

Static analysis result for SHA-256 22921014b55b1100…

MALICIOUS

PDF

64.9 KB Created: 2021-01-10 09:19:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f56e21625ed229a6f948c5af75e60eb8 SHA-1: 903e94d487d23ecf696923645abca8f9909a11d0 SHA-256: 22921014b55b1100824e6fca1c5373cf75f4ebe710d0f9114a1829783f603393
194 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, disguised as a device manual. This indicates a phishing attempt to lure users to a malicious site. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

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
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://cctraff.ru/aws?utm_term=arris+tm822+manual+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4409421/normal_5fd0ffa32e741.pdfIn PDF document text
    • https://nexajatolotol.weebly.com/uploads/1/3/4/3/134308242/56448.pdfIn PDF document text
    • https://site-1168287.mozfiles.com/files/1168287/doctor_fields_list_and_salaries.pdfIn PDF document text
    • https://zewubonorow.weebly.com/uploads/1/3/1/3/131398185/1177967.pdfIn PDF document text
    • https://site-1180295.mozfiles.com/files/1180295/global_business_manager_microsoft_salary.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374188/normal_5f9314af5916a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471691/normal_5ff762786cc08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387704/normal_5f90118c9da3a.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/luramamelolem/selfie_camera_photo_editor_app.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/67156442445.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/kujaxevi.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/71604767685.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/surf_fishing_report_oregon_inlet_n._c.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_off0000c240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC240 5504 bytes
SHA-256: 01e89374a21f758341440e1a653aec318dd57238fa19f98c596da78c821e7faf
font_01_sfnt_off0000d4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DF 9832 bytes
SHA-256: 56bd789bac7695560a644be7dd0b942d2afd5220b18e90f704313bc732be7925