Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a28c17985e9b37a…

MALICIOUS

PDF

80.7 KB Created: 2021-02-22 04:01:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 1e5c068878ef35cdd1fab920a068abce SHA-1: 4921f811fcf57c40bbfda615516e6eff05e6cc72 SHA-256: 7a28c17985e9b37ae6ffe7e179d3d7badaf5efc8b407ea8efc18839733b803a7
96 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 suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, appears to be related to technical content, likely a lure to disguise the malicious intent of directing the user to the external URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=what+is+process+control+in+system+call PDF link annotation
    • http://remastacer.com/mtg_card_maker_android52ixn.pdfIn PDF document text
    • http://pepirizibizedel.22web.org/gamoganabikugub.pdfIn PDF document text
    • http://nefritthebestthing.site/california_department_of_corrections_visiting_forms3md35.pdfIn PDF document text
    • http://nofovukad.iblogger.org/41618253649.pdfIn PDF document text
    • http://gipilunafa.iblogger.org/is_marlin_good.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://viwukekev.rf.gd/37711251712.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/bleach_brave_souls_all_ichigo_forms.pdfIn PDF document text
    • http://kusofiwu.epizy.com/carousel_templates_bootstrap_4.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/xowepudebajos.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/pononut.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/xisetad.pdfIn PDF document text
    • http://damaxokabipo.epizy.com/wirojewefimijapabararon.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/whooping_cough_vaccine_guidelines_australia.pdfIn PDF document text
    • http://nazonuretowu.epizy.com/vanilla_engineering_guide_elysium.pdfIn PDF document text
    • http://kijemuf.epizy.com/96724576040.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/27912349653.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/87297253142.pdfIn PDF document text
    • http://javajese.epizy.com/finopenonewimolumawatis.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/19173719117.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/tipixamolanaginudavatut.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_off00010006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10006 5288 bytes
SHA-256: e4653054978d4e3e83967c4f0c5b4c3476057acbaf177fb70b78f6edd840bf67
font_01_sfnt_off000111ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EA 10360 bytes
SHA-256: dbae7609183218c99f12ce5350a1c6d9af5bb17f05c98c8bdd2e403c668d4bc6

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