Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa2fbb27213f8b05…

MALICIOUS

PDF

72.3 KB Created: 2020-11-09 22:13:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2308c10528425ca2dcf4f97428c5f335 SHA-1: 87c4448bdc3c3122f963398cbbe4d8df121a6aed SHA-256: aa2fbb27213f8b05c31a2fef5b8badd5d8df03cd2d5680bfa8d62e7b90eb403c
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 specifically pointing to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged this file as malicious. The presence of numerous external links suggests an attempt to direct users to phishing or malware distribution sites, potentially disguised as search results or document repositories.

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.
  • 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://traffmen.ru/123?keyword=julie+chen+leslie+moonves+divorce In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372383/normal_5fa49b4d03a63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382194/normal_5f8f2fb79ec75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367642/normal_5f89d9391461a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404969/normal_5f99bf6ad7e8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370560/normal_5f93b6c983f88.pdfIn PDF document text
    • https://rabexowubomisuw.weebly.com/uploads/1/3/1/4/131407155/neserisibudopazas.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/sazariwapa/clark_c500_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/pagovipuwebededowemi.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/zojudopelefuwem.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/83902845383.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7526cc4d-e2ac-4251-94f6-b189d60058e4/rakex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bb08b16-32bd-4306-b407-6a8fd320ff3a/umbrella_academy_soundtrack_list.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/keurig_k-select_coffee_maker_matte_white.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/fidokis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/027b5db7-c3ff-4f91-b50a-6664626d6abf/download_suki_ni_naru_sono_shunkan_w.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF92 3820 bytes
SHA-256: bd4424bda13c0cc378ee796fe84481dba29cdd10d6f309bbb3e21aa488db3156
font_01_sfnt_off0000dd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD04 5020 bytes
SHA-256: a4e77d9f72d0655815c92380409f56462b0cf955fce89a250224c5893ccbea6b
font_02_sfnt_off0000edee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEE 11644 bytes
SHA-256: 4d36f5c4c82fde0b514801354d0ec90d2735664c3bd8b153fd6029d32cb8f0b1

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