Malicious PDF — malware analysis report

Static analysis result for SHA-256 203b30bc40816f1a…

MALICIOUS

PDF

73.6 KB Created: 2021-02-13 05:25:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 669b1aff1e5d0014ea2c8b0af93c5428 SHA-1: e89ccb9ae39b9e16168cf0fceefe6758fd017074 SHA-256: 203b30bc40816f1a41c5983f1261a4f4528f6e9f695297ca18f592db663a24ba
214 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, with one identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to art authenticity. The presence of numerous PDF links, many pointing to S3 buckets and other domains, indicates a potential link farm or distribution mechanism for malicious content. ClamAV and ML classifiers also flagged this PDF as malicious.

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://yafferge.ru/wb?keyword=template%20certificate%20of%20authenticity%20for%20art In PDF document text
    • https://cdn-cms.f-static.net/uploads/4406806/normal_60221725a0caf.pdfIn PDF document text
    • http://lestyprin.online/lagu_terdiam_dalam_sepi_remix0wv9v.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/bpjcfKU/ipad_app_to_test_wifi_signal_strength.pdfIn PDF document text
    • https://cdn.sqhk.co/miloniwuwave/cgiibfI/losung_doors_awakening_level_8.pdfIn PDF document text
    • https://cdn.sqhk.co/lepemafe/RiagfG1/wazerakukam.pdfIn PDF document text
    • https://juxibawazorar.weebly.com/uploads/1/3/3/9/133997202/lujisegukesunu_defewog.pdfIn PDF document text
    • https://lalidusuferub.weebly.com/uploads/1/3/4/4/134440540/9852277.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/C6gfdib/youtube_rush_greatest_hits_playlist.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/tajimipojimo/banner_life_change_of_ownership_form.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/bein_sport_free_live_stream_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/immunogenicity_guidelines_fda.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/31429691794.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/rimovojawofaturasugom.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_off0000e567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE567 5128 bytes
SHA-256: 702ce11ce3a2d5023b51727480d76a7dbd685b4f569e80dfa4b0915e4602d6cc
font_01_sfnt_off0000f6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B8 10136 bytes
SHA-256: a3931fe2f8eb8a402863b709f16167aad80030b2f9a18e115286fc0c1634d661

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