Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbab9eba80cc532c…

MALICIOUS

PDF

68.8 KB Created: 2020-12-21 23:33:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4861b129abc1a89dca80a1f0fc8d1a09 SHA-1: dc90c3a78b45398d993aa4ff798dfd52331046ed SHA-256: dbab9eba80cc532cbb37cbd1813ec682ce7d2d050bb60bc4e12a811f0ece1b38
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains a critical heuristic indicating it links to known malicious redirector infrastructure, specifically 'https://cctraff.ru/wb?keyword=check%20c%20compiler%20version%20ubuntu'. Additionally, a high-severity heuristic detected a lure to execute commands via the clipboard, instructing the user to paste content into a shell. This suggests the document is designed to trick the user into running malicious code, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://cctraff.ru/wb?keyword=check%20c%20compiler%20version%20ubuntu In PDF document text
    • https://cdn-cms.f-static.net/uploads/4423752/normal_5f9a12817d40a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447464/normal_5fb5d5f7bd610.pdfIn PDF document text
    • https://piborubaladedos.weebly.com/uploads/1/3/4/7/134764427/488c5e221d0e.pdfIn PDF document text
    • https://biwawidojimu.weebly.com/uploads/1/3/4/6/134648839/5824232.pdfIn PDF document text
    • https://mulibini.weebly.com/uploads/1/3/4/8/134881685/nixigufarisomakifal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452609/normal_5fa78e5d67f61.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc4d7f09698b02c7f39df58/t/5fcbff3ec836a917f9f76c65/1607204670587/petovolawuxarowelamepa.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/29895735011.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/kepirajos.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/best_air_purifier_for_allergies_consumer_reports.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abeb6e09-c659-4845-bbe4-13212a93b38f/90387354550.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc29c1b8787e8798976ec1d/t/5fc72e132ac13f1ee9b6120e/1606888980374/totally_wiped_out_mod_apk.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_off0000ccd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD0 5132 bytes
SHA-256: 148f180dcbd097414a43544f8885387e47399f42cad382c7c8b1fadc1401e98b
font_01_sfnt_off0000de1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1D 11804 bytes
SHA-256: 36918dd721b16e9f4c198b4c5a3c839a7bec310ff78ca06ac74ca55422f7d24b

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