Malicious PDF — malware analysis report

Static analysis result for SHA-256 149440ed636fc700…

MALICIOUS

PDF

68.4 KB Created: 2021-02-19 18:24:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6775583a473b6f62054f2997def3fb96 SHA-1: dfd511e3a52fa6b6795d419aea334d76a21fee70 SHA-256: 149440ed636fc700fde16c2a11ddeedf22f00c6fbc5bee6584eb05b2d7a5dcf7
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, and ML classifiers and ClamAV also flagged it as malicious. The document body, though heavily obfuscated, suggests a lure related to an 'answer key' for a 'reconstruction failure'. The embedded URL likely leads to a phishing page or a further stage of malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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=dbq+10+reconstruction%2527s+failure+answer+key In PDF document text
    • https://cdn.sqhk.co/dubeminap/hhPwwcm/mumasiveranebarugi.pdfIn PDF document text
    • https://cdn.sqhk.co/riwaxagi/gThgei1/evil_zone_wiki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413455/normal_6021ee9182f8a.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/gf5CPSw/mastercraft_courser_cxt_275_70r18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426262/normal_60192bcb51c28.pdfIn PDF document text
    • https://cdn.sqhk.co/galudubujuwa/bniihdR/dune_1984_imdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421215/normal_60159360b54d5.pdfIn PDF document text
    • https://cdn.sqhk.co/maxevurux/cqGayjd/95147103577.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413019/normal_601a7f9711a32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501660/normal_5fdef21f2f3e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416664/normal_60062992de488.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408174/normal_6001f29484ae8.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/tiduro/alesis_v_mini_software.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/44522288212.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/whatsapp_pc_windows_7_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zafirawit/57246377141.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/77886409797.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/psychrometric_chart_calculator_free.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_off0000cdb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB9 5628 bytes
SHA-256: f41a1559b37040bf720a9e224d6012dc36b8d240dbb011373a174fe08c57656d
font_01_sfnt_off0000e127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE127 10212 bytes
SHA-256: ecd625bb9448662a14cd85a3d70fb6e0ee2ceaed35d79fd763126cb2ee7952c6

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