Malicious PDF — malware analysis report

Static analysis result for SHA-256 a522dc7f4139f012…

MALICIOUS

PDF

67.7 KB Created: 2021-02-04 10:31:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: fdd92954e79be91b8e2e3b60ea27d4e5 SHA-1: f1a36eb049271004e9136291d216f4b6276cdd22 SHA-256: a522dc7f4139f01275cc72a9b1cb578a7243e4c23c3af55c8c60092b39ba2bdc
194 Risk Score

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://yafferge.ru/123?utm_term=15+feet+10+to+inches In PDF document text
    • http://nususolajegak.iblogger.org/20104357943.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415081/normal_601ba5558c10a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413118/normal_6015665b89997.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471085/normal_6011380da5772.pdfIn PDF document text
    • http://xexuxofaz.22web.org/kali_amman_video_songs_free.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/mizeteb/56453203776.pdfIn PDF document text
    • http://bepinutarefe.rf.gd/oxford_discover_5.pdfIn PDF document text
    • http://supetok.rf.gd/escapists_2_item_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/aetna_vision_eyemed_claim_form.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/81656403810.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/arduino_328p_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/b_blood_type_diet.pdfIn PDF document text
    • http://likasiz.epizy.com/linkedin_cover_photo_template_psd.pdfIn PDF document text
    • http://lizuratudesaxop.epizy.com/absceso_periapical_caso_clinico.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/30044894983.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_off0000ce75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE75 4856 bytes
SHA-256: 3d0d40aa8e60896460324f76de8f1b579f04b3e6be9bdb6f86bb313e6e598a74
font_01_sfnt_off0000df0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0D 10260 bytes
SHA-256: 1c1e4ee1ed137cbecd700fdcb333552b4038ae42b6248ae386b4a5230dba49a4