Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd24bc86ff091dce…

MALICIOUS

PDF

77.9 KB Created: 2021-02-24 17:24:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 896e6a02d95003715198c51616b6f630 SHA-1: 2abe4377d07253770dea86acbb1ff7946c96438e SHA-256: cd24bc86ff091dce34513a45748fb727b30433782596d0d6d623a654c00c88a8
104 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document body contains urgency-related language, and an external URI pointing to 'bologen.ru' was extracted, which is likely a phishing or malware distribution URL. While no scripts were directly extracted, the PDF structure and the presence of external links suggest an attempt to redirect the user to a malicious site.

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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://bologen.ru/strik?utm_term=how+to+connect+nec+phone PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410416/normal_5fd9d0fbd90eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403817/normal_5ffc2d877f0ec.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefu/6ibjb5o/jumavef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529095/normal_60052103556a7.pdfIn PDF document text
    • http://raguvigawak.mypressonline.com/dofiwokijigufefixapison.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484143/normal_5fdc261b3d2eb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/juzowilipi/27288356251.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/compatibility_report_natal_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/61575102739.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/rilerikibuladeso.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/pokemon_3ds_games_on_android.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/mage_the_ascension_20th_anniversary_download.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/btec_engineering_level_3_assignments_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/google_chrome_themes_for_android_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/bagokiko/29122773071.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/hungry_dragon_apk_mod_1._16.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_off0000e7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A8 4296 bytes
SHA-256: ac07cdb31318ad5f94d7f404a5de135b974b7a18e8f17fe7ee4b6e68d8612380
font_01_sfnt_off0000f639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF639 11540 bytes
SHA-256: 0a4bf870f6886974524bdea6939677df8068f55a580056f918d7b4d39ccc4d7f
font_02_sfnt_off00011c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C45 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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