Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b101807a03f7ef…

MALICIOUS

PDF

70.4 KB Created: 2021-03-15 20:16:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7a0729be3a9317f2e15f94295327c83 SHA-1: ceed64875ad9735b938f802a29d0016c34359262 SHA-256: a6b101807a03f7efad775299bae3990e499fb80d3f54e36d08c24080684131c0
96 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains an embedded URI pointing to 'https://dafemum.ru/wix?keyword=dilations+and+scale+factors+worksheet', suggesting a phishing or malware distribution lure. The document body, though heavily obfuscated, appears to be a worksheet, reinforcing the lure. The presence of numerous other suspicious URLs further supports the malicious nature of this file.

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
  • 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://dafemum.ru/wix?keyword=dilations+and+scale+factors+worksheet
    • https://cdn-cms.f-static.net/uploads/4450638/normal_6016fa8065a34.pdf
    • http://xudogiborijum.66ghz.com/jatadenajiwamezezibebuvu.pdf
    • http://kino-vezde.ru/free_download_3d_max_2009_software_full_version_with_crackrdrx3.pdf
    • https://cdn-cms.f-static.net/uploads/4416151/normal_600a9235a4e17.pdf
    • https://static.s123-cdn-static.com/uploads/4465398/normal_5ff652ad21cf1.pdf
    • http://pisozuzata.iblogger.org/bonolesosakejazavine.pdf
    • https://lemefiware.weebly.com/uploads/1/3/4/0/134017231/b0950952390.pdf
    • http://kayikciakademi.com/35649103341clamo.pdf
    • http://kirademom.22web.org/65142814708.pdf
    • https://fisezogidegogef.weebly.com/uploads/1/3/2/3/132303301/4159430756b3e3.pdf
    • https://static.s123-cdn-static.com/uploads/4408721/normal_5fe0a9114fe4c.pdf
    • http://hookup157.site/pevam4id64.pdf
    • https://pedasivu.weebly.com/uploads/1/3/5/3/135387907/6220000.pdf
    • https://juwomazitebuden.weebly.com/uploads/1/3/1/4/131414743/duwoxaris_gifiwija_kivovoreza.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xilasisefi/32922595649.pdf
    • http://kuwosuz.rf.gd/12541504855.pdf
    • https://s3.amazonaws.com/jamuluvuvava/tajutaxopuneledos.pdf
    • http://palenogawufagi.epizy.com/posowiz.pdf
    • http://gijodege.epizy.com/my_passport_ultra_work_with_mac.pdf
    • http://zaniwemikadas.rf.gd/coyote_call_app_android.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d619.bin
90392ffa77cdd6ac5c19f6a08383ad89d1c43241dc3fdd84a4ff73292756d93c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD619 5264 bytes
font_01_sfnt_off0000e812.bin
d1e330cd11a9d8f1b14e9d3eb5f60fae6a9e1fbe4895fbe110381c98d874d2e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE812 10656 bytes