Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c3a318fddac024…

MALICIOUS

PDF

86.7 KB Created: 2021-01-03 21:13:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 9722fe33d9eab4a717df97dcc53012b9 SHA-1: 7d026ba4019411c56ca7e6c9a9ce8e02c92d692d SHA-256: 09c3a318fddac024db91e8f1db901eaed51b5a8ebf06f13f43041f2b9a52f7fe
104 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a potential APK download. Heuristics indicate it's a phishing attempt, and ClamAV detection confirms it as malicious. The ML classifier also flagged it with high confidence. The document body, though heavily obfuscated, contains references to 'apk' and 'wkhtmltopdf', suggesting a download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/wb?keyword=choice%20of%20magics%20apk PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485012/normal_5fe14ed3cb3e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459796/normal_5fca5e11419c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389358/normal_5fd172f326357.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368985/normal_5f892e5a1f0c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448719/normal_5fbe651633a3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392661/normal_5fbc1f8335f72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365555/normal_5f8ceed26a5a0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/pisik/timesaver_speaking_activities.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/immutable_infrastructure.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/aiims_delhi_exam_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/general_knowledge_quiz_uk_questions_and_answers.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF1 5272 bytes
SHA-256: 978e8f6215cbd80a9ef095586f3dd4b1b74bd202124bc6e6246f6ba414feba6a
font_01_sfnt_off000100b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B6 5804 bytes
SHA-256: 2b7d69dc671880293e41dec821d80cbac653d5b283f44a11724d5151d1d595ae
font_02_sfnt_off00010f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4C 12228 bytes
SHA-256: ef4f13713128f2881253d554cb5236f0a4a165466404a950e0b107d7d27164f6
font_03_sfnt_off0001386c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1386C 16140 bytes
SHA-256: 5bfda07072dd2e1b0df7f1680a75ba616774ec51e1a09c257f000ba239241e1c

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