Malicious PDF — malware analysis report

Static analysis result for SHA-256 55cab3080b861217…

MALICIOUS

PDF

72.7 KB Created: 2021-02-22 12:52:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 07cdef2ec4a60c78dfd71dea03439187 SHA-1: 0ca8b1a270b6bfa82ae88eec607ebe89061ccfae SHA-256: 55cab3080b8612170337bbea45d99689dd6f9080ef139656e2e4611cc505bb6e
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a 'download button' heuristic suggests a lure to download a payload. The embedded URL points to a suspicious domain, likely hosting the secondary malicious content.

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
  • 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://leonvi.ru/aws?utm_term=spoken+english+course+online+free+video+dailymotion PDF link annotation
    • https://cdn.sqhk.co/detatakev/hbEoric/islanders_score_from_last_night.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471688/normal_5fe46600d20a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471711/normal_5fe70bc8c1ade.pdfIn PDF document text
    • http://susurrus.space/ejercicios_resueltos_de_termodinamicfoh9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485450/normal_5fd3ddbdc1fae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419437/normal_5fe2286944fc2.pdfIn PDF document text
    • https://cdn.sqhk.co/jenotefi/geheieZ/sajilogogoxegisopojowo.pdfIn PDF document text
    • http://uscreditmonitoring.info/58438401853lj5dy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391634/normal_5fcd0790ed56a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494436/normal_6025a958cf62b.pdfIn PDF document text
    • https://cdn.sqhk.co/tovisegag/B0haidl/infinity_stones_powers_and_colors.pdfIn PDF document text
    • http://dkblogin-de.best/sales_follow_up_call_script_template0o9uk.pdfIn PDF document text
    • https://cdn.sqhk.co/fiporalisu/mXijkij/photo_collage_maker_collage_maker_photo_editor_online.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/wiwamoxamo/estratificao_de_risco_cardiovascular.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_off0000db3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3A 5900 bytes
SHA-256: 7ea93f477640796254721231a1793349cbcb759d497abed483f920654f4ff2ba
font_01_sfnt_off0000ef3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3B 11468 bytes
SHA-256: 83c6ac9860b804af3e607de1048d097ffbf268e47f2d0b637bad407389d1a9fe

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